[norman784]

I think comparing Steam and to some extend Apple with payment methods, they are stores and it cost money to store apps and games and for this one I'm not 100% sure, but I read a while ago that they also pay taxes for you in the country you sell, while pure payment processing services are just a proxy to move money from one account to another. You could argue that 30% is high for that, but we aren't discussing it here.