$99 per year for your developer account required to distribute applications. At AWS pricing, that's a bit over a TB of traffic. At any normal pricing, that's anywhere from 10TB to a few hundreds. At volume pricing, that's even more. How many apps are paying for traffic they don't use? Apple pockets millions.

> Only if you charge for your app - and how much free labor and bandwidth do you give away? Apple gives away millions.

I guess a ~2% fee would cover those costs.