What evidence do you have to support the allegation that Apple makes a profit on every App sold?
Firstly, there's the cost of having the application tested, approved, uploaded and categorised. There's also the cost of hosting the app as well as the credit card processing fees. Users have the right to re-download any app they've purchased in the past. What about a 99c app that weighs in at 2GB? Does Apple really make a profit after credit card processing fees and bandwidth costs?
As for the $99/year developer fee, there are costs involved in providing support, moderating forums, and approving applications.