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by conductr 945 days ago
30% is because most transactions, early on, were around $1. And processing fees are usually $0.25 + ~3% = so 28% of the average transaction.

When you start applying that 30% to $15 spotify subs, $50 uber rides, $60 video game, then a bunch of in-app purchases ranging in value; the math falls apart and if you have scale to do it, the negotiated rate makes more sense for those businesses given the average transaction amount.