my point is that it’s entirely possible to offer the same thing for cheaper if your main concern is cost, especially for higher volume merchants, and not optimizing for developer experience https://www.costco.com/merchant-account.html
AFAIK they see themselves as a "premium" processor, not as a cheap one.
If you choose Stripe, you're doing so for the dev experience, their ML whatever, better testing suite, integrations, etc.
And you're doing that consciously.
I much prefer a company that takes a slightly higher percentage and provides a great service
than the @#$# at Paypal who will freeze your accounts for reasons like 'your earnings are growing too fast' or 'you compete with our fellow silicon valley company'
That's not surprising. But they seem to do what they do well, and have a lot of happy customers.