Thinking about this a little, I can kind of understand why Amazon would consider entering this business. Even if Apple would allow it, probably no other company

Thinking about this a little, I can kind of understand why Amazon would consider entering this business. Even if Apple would allow it, probably no other company would invest significant resources into trying to unseat the Apple AppStore. You have to have some kind of leverage to beat a competitor like that. The situation is different with Android. Building a better app marketplace than the Android market is not exactly a very high bar to leap.