Mac developers, be grateful that Apple still allows you to sell applications for their platform that don't go through the "Mac App Store". Apple's general approach to applications on their platforms is "if it's profitable, it's ours". Try writing a competitor to iTunes.
Apple wants to provide a good out-of-the-box experience. That means their devices come with what customers really need. Apple now views aftermarket apps the way Detroit views aftermarket car accessories.
Mac App Store developers, you are in the same business as the company that makes the little tree-shaped air fresheners for cars. Deal with it.