Why is it so many people seem to attribute everything that has to do with Apple to Steve Jobs? 'Steve Jobs will protect them', 'Steve Jobs won't let X onto the App Store' 'Steve Jobs doesn't like Y'. Are people doing the same thing with Microsoft and Ballmer, Ubuntu and Mark Shuttleworth, or RIM and Mike Liza..liza...lizard-something and I have just not noticed? Because I don't think they are, and I don't really understand why they do it. Yes, Jobs is a major part of Apple, and has a huge say in the major (and some minor) decisions there, but it isn't like he is personally approving/disapproving individual apps, or things of that nature.
Anyway, your argument that Mac owners have more disposable income, and are therefore ideal targets is fine except... why have they waited until now? Macs have become cheaper over the years, not more expensive. And while there are more users now than ever before, it doesn't change the 'they have more money, so are better targets' angle.