Even so, our accounting department still can't fully untangle the mess of foreign transfer and conversion fees, float-related costs, gateway fees, amex vs visa discount rate differentials, pci compliance service fees, and all the other horrible shit that Stripe eats for you, in order to give me a straight answer as to whether or not we currently pay more or less than 0.30 + 2.9%.
This is not a hit on our accountants, cybersource, stripe, or our merchant bank - just making the point that it's not so easy to state categorically that Stripe's fees will turn off somewhat larger volume customers.