If I ask you to take your shoes off before coming inside my house, and you tromp on in with your shoes still on and naively expect I'll just be cool with that, don't be surprised if I just kick you out of my house instead. And then don't expect anyone to care when you go protest in the public square about the injustice of me not letting you violate a rule I hold everyone (including myself) to.
(At any rate, didn't Apple actually reduce fees to 15% for smaller companies last year? Isn't that still in effect?)