Comment Re:math doesn't add up (Score 1) 55
That's because those percentages stack.
Personally I would recommend Bandcamp (I'm a customer, not a shill, before you ask), if you don't have the resources to roll-your-own (it's free upfront, no setup or subscription, but takes 15% off all sales).
Actually, some of us are trying to push Bandcamp to move payment processing in house rather than use Paypal, considering Paypal fees, reputation, and all that jazz. Not sure if they will, but it is a thing that I would like.