Opportunity cost. The iPhone, and the iPad to an even greater extent, have lots of potential that can't be (easily/legally) utilized because of Apple's control. That's not true of earlier phones, which were too technically limited to do a whole lot even if they were open. It's also not true of consoles which are just locked down PCs; there's not much you could do with a hacked Xbox that you couldn't also do with a Mac mini.