Amazon vs. Your Own Store: The Real Margin Math, Line by Line
"Should we be on Amazon or our own site?" is the wrong question — but the margin math behind it is the right obsession. The same $60 product, sold to the same customer, can net anywhere from $8 to $24 depending on the channel carrying it. Most operators know the fees exist; far fewer have built the honest side-by-side. Here it is, line by line, with the strategic logic that falls out of it.
- Marketplace all-in take (referral + fulfillment + required ads) commonly lands at 30–45% of revenue; an owned store's equivalent stack (processing + shipping + apps) runs 15–25% — but YOU pay for the traffic.
- The real difference isn't the fee stack — it's who owns the customer: Amazon transactions create Amazon customers; your store creates contactable, re-marketable ones.
- First orders can be cheaper on Amazon; second orders are radically cheaper on your own store. Channel strategy is really a repeat-purchase routing problem.
The teardown: one $60 product, two channels
| Line | Amazon FBA | Own Store (Shopify) |
|---|---|---|
| Revenue | $60.00 | $60.00 |
| Landed COGS | -$18.00 | -$18.00 |
| Referral fee (15%) | -$9.00 | — |
| Fulfillment | -$8.50 (FBA) | -$9.50 (3PL + shipping) |
| Payment processing | included | -$2.00 |
| Platform/apps | -$0.50 | -$1.50 |
| Advertising (effective) | -$7.00 (12%) | -$14.00 first order / ~$1 repeat |
| Contribution | $17.00 (28%) | $15.00 first (25%) / $28.00 repeat (47%) |
Read the last row twice. On a first order, Amazon often wins — its conversion rates are unmatched and its ad auction, while expensive, targets buyers inches from checkout. On a repeat order, the owned store isn't a little better; it's nearly twice the margin, because the second visit arrives via a $0.01 email instead of a $14 ad, and there's no 15% referral toll on a customer relationship you already own. Every analysis that compares the channels on first-order economics alone — which is most of them — misses the entire game.
The asset question underneath the fee question
Amazon never tells you who your customer is. No email, no remarketing, no cross-sell, no cohort analysis beyond what the platform deigns to share. Strategically, marketplace revenue behaves like high-margin wholesale: real money, zero relationship. That's also exactly how acquirers price it — marketplace-dependent brands transact at visible discounts to owned-audience peers (the concentration penalty in our multiples guide), because the buyer inherits revenue without inheriting customers. The aggregator era demonstrated the terminal version of this trade at $15B scale.
The portfolio answer
The winning pattern across resilient brands is boringly consistent: Amazon as the acquisition tollbooth and search-demand harvester; the owned store as the relationship and repeat engine; and a deliberate handoff between them — package inserts, warranty registration, replenishment programs, exclusive bundles — moving second purchases to owned rails. Wholesale and retail then sit on top as margin-diverse stabilizers. Channel religion in either direction costs real money: pure-DTC orthodoxy forfeits the cheapest high-intent demand pool in commerce; pure-marketplace pragmatism builds a business you rent rather than own.
Amazon is where customers are cheapest to find. Your store is where they're cheapest to keep. Strategy is the plumbing between the two.
- We model every target's contribution by channel AND by order number — first vs. repeat — before pricing it.
- Post-acquisition, the marketplace-to-owned handoff is a standing workstream with a measurable target: repeat-order share on owned rails.
- Neither channel ideology survives contact with this table. We're channel-agnostic and margin-devout.
Sources: Amazon seller fee schedules and FBA rate cards; Shopify/processor published pricing; 3PL rate benchmarks; operator P&Ls (directional composite). Companion pieces: The $62B Tollbooth, Owned Audience Economics.
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