I think people are focused on the wrong issue. The fee % is not the problem. The problem is the restriction against using other types of payment processors. I am 100% OK with Google, Apple, or whoever charging whatever price they want to charge for using their app store services. They are, after all, providing all of the infrastucture for software delivery, updates, payments, etc. Not to mention giving you access to…
As a iOS user I feel safer that all payments go through apple. I am assured of certain level of privacy and security which is very comforting.
Consumers can continue to use app-store payments if they wish (and I bet the vast majority would), but developers and companies can no longer complain about Apple's monopoly over payment processing.