
The Core Insight
“Branded search was a tax we all paid. This is now even closer to payment.” — Sean Frank, CEO of Ridge
Merchants face an impossible choice: pay Google for visibility (ads) or pay OpenAI for conversion (transaction fees). Both extract value from the merchant—just at different points in the funnel.
The question isn’t which tax is better. It’s whether AI commerce creates enough incremental value to justify the cost. The math changes based on your margins, AOV, and return rate.
How Each Platform Extracts Value
Google’s Tax: Pay for Visibility
- Pay whether or not user buys
- Predictable ad spend budgets
- Spend more = more visibility
- 0% transaction fee
Who wins: High-margin, high-AOV products (can absorb CPC as marketing cost)
OpenAI’s Tax: Pay for Conversion
- Pay only when user buys
- Variable cost tied to revenue
- Organic ranking (no pay-to-play)
- Refunded if item returned
Who wins: Low-margin, high-volume sellers (can’t afford upfront ad spend)
When Each Model Wins: A Simple Example
Scenario: $100 Product, 3% Conversion Rate
| Google Model (CPC) | OpenAI Model (Transaction Fee) |
|---|---|
| Assume: $2.00 CPC × 100 clicks = $200 ad spend | Assume: 5% transaction fee |
| 100 clicks × 3% conversion = 3 sales × $100 = $300 revenue | 3 sales × $100 × 5% = $15 total fee |
| Effective “tax”: $200 / $300 = 67% (of revenue, before COGS) | Effective “tax”: $15 / $300 = 5% (of revenue, before COGS) |
But It’s More Complicated
| Factor | Google Advantage | OpenAI Advantage |
|---|---|---|
| Visibility vs. Ranking | Pay more = more prominent | Organic only, no buying position |
| Returns Risk | Already paid for the click | Fee refunded on return |
| Scale Economics | Fixed CPC regardless of volume | Fee scales with every sale |
This is part of a comprehensive analysis. Read the full analysis on The Business Engineer.









