Greed sure, but it's also control. Apple has always been fanatical about controlling what the user, seller, repair shops, retail, etc can do with their products. Among other reasons, its one of the top reasons I'll never use Apple computers. I want complete control of my devices, and the ability to break my machines while pushing boundaries. Apple would rather have me locked in to their 30% fee App Store cash cow with apps that require their approval to exist.