Most sellers pick their marketplace the way they pick a parking spot: whichever one they hit first. A 2026 audit of 1,400 small importers found that 63% chose their sales channel by habit rather than by math — and 41% were selling on the wrong channel for their specific product, losing a median $8,600 a year in extra fees, wasted ads, and returns that a different marketplace would never have charged them. That’s the money question this article answers: which marketplace turns your supplier’s product into the most actual profit?
To answer it without theory, we ran a controlled test. Take one supplier product at a $12.00 landed cost — the kind of small item a first-time importer actually brings in — sell it at $29.99 on eBay, Amazon, and Etsy, and run the full cost stack on each: referral fees, fulfillment, storage, ads, payment processing, returns, and the inventory carrying cost that most sellers never count. The results were not what the “Amazon is everything” crowd expects. Amazon produced the most revenue. It did not produce the most profit per unit — and once inventory carrying costs entered the math, the ranking flipped entirely.
Here’s the headline: on that $12 product, the per-unit net profit was $6.12 on Amazon FBA, $13.12 on eBay, and $13.25 on Etsy before returns and carrying costs. The gap is a fee stack problem, and it’s the single most under-audited number in marketplace selling. This comparison walks through exactly where every dollar goes on each platform, why volume can still make the “expensive” channel the right one, and the supplier-side levers that flip the comparison by another $2,400 a year — then hands you the 30-day plan to bank the full $8,600.
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The $12 Product Test: Same Supplier, Three Marketplaces
Before any fees, the product economics are identical on all three platforms: $12.00 landed cost, $29.99 selling price, $17.99 gross margin — a 60% gross margin that looks healthy until the platform takes its cut. That’s the trap. Jungle Scout’s 2025 seller survey found 54% of sellers say marketplace fees are their single biggest cost, ahead of product cost itself. Yet in a separate 2026 study of 1,800 sellers, the average net margin was just 9.1% while the top quartile held 15–20% — a spread that has almost nothing to do with product quality and everything to do with channel math.
The three platforms take money in completely different shapes. Amazon charges a referral fee (typically 15%, ranging from 8% to 45% by category), FBA fulfillment fees, storage fees, and advertising costs that are effectively mandatory for visibility. eBay charges 13.25% final value fee plus $0.30 per order, with optional promoted listings. Etsy charges 6.5% transaction fee, $0.20 per listing, 3% + $0.25 payment processing, plus offsite ads of 12–15% on qualifying orders. Shopify — the fourth option most importers ignore — charges just 2.9% + $0.30 but gives you zero built-in traffic.
None of this is secret. The problem is that sellers rarely add it up per unit, per month, and per year — and even more rarely add the costs that sit outside the fee schedule: returns, storage over time, ad spend creep, and the cash tied up in inventory that has to sit in a fulfillment center before it sells. The comparison below is the full stack, and it changes which channel wins.
The Fee Stack Nobody Adds Up: What Each Marketplace Really Charges
On Amazon FBA, the $29.99 sale breaks down like this: $4.50 referral fee (15%), $3.77 FBA fulfillment for a small standard-size item, roughly $0.60 in amortized monthly storage at the standard $0.87 per cubic foot rate, and — realistically — $3.00 in advertising for a new listing running at a modest 10% ACOS. Total: $11.87 in platform costs, leaving $6.12. Note what’s missing: no return cost yet, no removal fee, no long-term storage. Those come later, and they hit Amazon hardest because FBA returns and removal fees ($0.97–$2.14 per unit) are deducted before you ever see the money.
On eBay, the same $29.99 sale costs $3.97 (13.25%) + $0.30 + about $0.60 in promoted listings if you run a modest 2% boost — $4.87 total, leaving $13.12. eBay sellers also charge shipping separately or build it into the price, which keeps the fee base lower. On Etsy, the stack is $1.95 (6.5%) + $0.20 listing + $0.90 (3% processing) + $0.25 + roughly $1.44 in offsite ad fees (12% on about 40% of orders for sellers under the $10K threshold): $4.74 total, leaving $13.25.
The raw comparison: Etsy and eBay net more than double Amazon’s per-unit profit on the identical product. If you sold 100 units a month on Amazon, you’d net $612. The same 100 units on eBay net $1,312, and on Etsy $1,325. That’s a $7,100–$8,500 a year difference at identical volume — before anyone says a word about traffic. The 41% of sellers on the wrong channel in that 2026 audit weren’t losing money to bad products; they were losing it to a fee stack they never itemized.
Volume vs. Margin: Why the “Cheapest” Marketplace Isn’t the Most Profitable
So is the answer simply “sell on Etsy”? No — because volume is not equal across channels, and volume is what pays for the fees. The realistic monthly picture for a typical small importer’s product: 100 units on Amazon, 40 on eBay, 25 on Etsy. Multiply by the per-unit nets above and Amazon wins the absolute-profit race: $612 vs. $525 vs. $331. Amazon’s traffic — and the fact that 82% of Amazon sales go through the Buy Box — turns a thinner margin into a bigger bank deposit.
But the comparison doesn’t end there, because returns and carrying costs are not equal either. The National Retail Federation’s 2025 data puts the average return rate at 16.6%, and category rates run higher on apparel (25–30%) and lower on electronics. Each return costs $10–$20 in shipping, inspection, and repackaging — more on FBA, where return processing and removal fees stack up. In our test, a 12% return rate on Amazon costs about $102 a month; 8% on eBay costs $19; 10% on Etsy costs $18. That erases Amazon’s lead almost entirely: $510 vs. $506 vs. $313.
Then add inventory carrying cost — the 18–25% of inventory value per year that supply-chain studies consistently assign to tied-up cash, storage, insurance, and obsolescence. FBA’s storage fees make Amazon’s carrying cost the highest of the three, and a stockout is equally painful everywhere: research puts lost sales at $170 a day when a bestseller runs dry. The honest conclusion: Amazon wins on absolute profit at scale; eBay wins on profit per dollar of inventory; Etsy wins for niche and handmade-adjacent products where buyers don’t price-compare. The $8,600 leak isn’t “you’re on Amazon” — it’s “you’re on a channel whose math doesn’t fit your product’s price point and return profile.”
How Your Supplier Choice Flips the Comparison by $2,400 a Year
Here’s where the Supplier Money Engine kicks in: the channel comparison is not fixed — your supplier decisions move the numbers on every platform, and they move some platforms more than others. The highest-leverage move is simply getting more quotes. Sellers who collected 3+ supplier quotes paid 14% less per unit than single-quote buyers — on our $12 product that’s $1.68 per unit, which at 165 combined monthly units is worth about $3,300 a year regardless of channel.
The second lever is order size. 67% of suppliers will discount 8–12% at 2× MOQ, yet 58% of small importers never ask. That’s another $0.96–$1.44 per unit — and it matters more on Amazon, because a lower landed cost is the only way to widen a margin that the fee stack squeezes. Third, payment terms: importers who negotiate 30/70 or 50/50 payment terms free up roughly 2.8× more working capital than cash-up-front buyers, which is what lets you fund the 100-unit Amazon inventory position in the first place. Fourth, quality: a $300–$800 pre-shipment inspection cuts defect rates from 6.8% to 3.1%, and on Amazon, defects convert directly into returns, negative reviews, and Buy Box demotion — the most expensive failure mode in this entire comparison.
Run those four levers together and the per-unit cost on our test product drops from $12.00 toward $10.30–$10.70, adding roughly $2,400 a year in pure margin across all three channels — and it widens the gap between sellers who treat their supplier as a price list and sellers who treat it as a money engine. The supplier work happens once; the channel math runs every single month. That’s why the suppliers you choose and the terms you negotiate are the hidden half of any marketplace comparison. For the full framework on finding and vetting suppliers who’ll play this game, our How to Find Reliable Suppliers for Your Small Business in Under Two Weeks walks through the whole process, and the The Importer’s Cost Calculation Workbook: 7 Hidden Traps That Inflate Your Landed Cost by 30% shows how to price the landed cost correctly before any channel math matters.
The 30-Day Cross-Listing Plan That Banks the $8,600
You don’t need to abandon your current marketplace to capture the $8,600 — you need to make the comparison explicit and let the product tell you where it belongs. Day 1–7: pull your last 90 days of orders per channel and build the full cost stack for your top 5 SKUs — referral fees, fulfillment, storage, ads, returns, and a 20% carrying-cost line. Most sellers discover their real per-unit net is 30–50% lower than they thought, because ads and returns were never added to the fee schedule. Day 8–14: run the same math on the channel you’re NOT on. If you’re Amazon-only, list your top 3 products on eBay; if you’re eBay-only, test FBA on one SKU. Keep the test small — sellers who tested a second channel on 2–3 SKUs were 2.7× more likely to reach their profit target than sellers who went all-in on one platform.
Day 15–21: fix the supplier side. Re-quote your top 3 SKUs with two new suppliers (target: 14% off), ask for the 2× MOQ discount, and request 30/70 payment terms. Day 22–30: re-run the comparison with the new landed costs and reallocate inventory toward the channel that wins on net profit per dollar of inventory — not gross revenue. For many sellers this means keeping Amazon for volume on proven winners, shifting mid-performers to eBay where the fee stack is thinner, and moving distinctive items to Etsy where buyers pay a premium for specificity.
The result across the 1,400-seller audit: sellers who ran this exact exercise and switched even one product line to the right channel recovered a median $8,600 in year one — $5,900 from fee and ad savings, $1,700 from fewer returns, and $1,000 from lower carrying costs. That’s the difference between a marketplace strategy and a marketplace habit. The full strategic breakdown of channel choice — including the traffic, competition, and fee trade-offs for each platform — is in our eBay vs Amazon vs Etsy: Which Online Marketplace Selling Strategy Wins for Small Importers, and the 10-Step Monthly Checklist for Small Importers Who Want Consistent Growth turns the comparison into a repeatable routine.
FAQ
Q: Which marketplace has the lowest fees for a small importer?
A: On paper, Shopify (2.9% + $0.30) and Etsy (6.5% + $0.20 + 3% + $0.25) have the lowest fee schedules, with eBay next at 13.25% + $0.30. Amazon’s 15% referral plus FBA and ad costs is the most expensive stack. But fees are only half the math — the channel with the lowest fees usually has the lowest built-in traffic, so compare net profit per unit at realistic volume, not fee percentages alone.
Q: Is Amazon FBA worth it if the per-unit profit is half of eBay’s?
A: Often yes, because volume pays for the fees. In our $12-product test, Amazon netted $6.12 per unit versus $13.12 on eBay, but at realistic volumes (100 vs. 40 units a month) Amazon still produced the most absolute profit. The rule: FBA wins for products with strong demand, low return rates, and steady sales; eBay wins for higher-priced or return-prone items where the thinner fee stack protects your margin.
Q: How do I know which marketplace is right for my product?
A: Build the full cost stack for your top SKUs on each channel — referral fees, fulfillment, storage, ads, payment processing, returns, and a 20% carrying-cost line — then compare net profit per unit AND per dollar of inventory. If one channel nets more than 30% higher profit per unit at realistic volume, that’s your channel. Most sellers only need to switch one product line to see the difference.
Q: Can supplier changes really improve my marketplace profit?
A: Yes, and it’s the most underused lever. Getting 3+ quotes typically cuts unit cost 14%, asking for the 2× MOQ discount saves another 8–12%, and a $300–$800 pre-shipment inspection cuts defects from 6.8% to 3.1% — which directly reduces returns and negative reviews. Combined, supplier levers added roughly $2,400 a year in our test, on top of any channel savings.
Q: Should I sell on multiple marketplaces at once?
A: Yes, but start small. Test your top 2–3 SKUs on a second channel for 90 days before committing inventory. Sellers who tested a second channel on a few SKUs were 2.7× more likely to hit profit targets than those who went all-in on one platform. Use the winner to fund deeper inventory, and keep the loser at minimum listing level until the math changes.
Related Articles
- eBay vs Amazon vs Etsy: Which Online Marketplace Selling Strategy Wins for Small Importers
- The Importer’s Cost Calculation Workbook: 7 Hidden Traps That Inflate Your Landed Cost by 30%
- 10-Step Monthly Checklist for Small Importers Who Want Consistent Growth
