[headhuntermdk]

First of all, that $100 a year should cover all of what you just listed.

It costs Apple approximately $100 million to run the store. If the ~20 million developers are chipping in $100/yr, Apple is looking at $2 billion in fees just from developers. You can further take the costs of developing a secure platform just from the sales of iOS devices. (Its not like the iPhone is useful without the AppStore).

Apple is one of the most successful companies in the world worth over $2 trillion. They would be just fine dropping the fees from 30% (now 15%) to a more standard 2% for a basic transaction fee.