Look, I see where you're coming from (and I'm irritated that you're treating me like I don't know what I'm talking about), but this is and always has been Apple's achilles' heel. They are not the sort of company that attempts to subvert the mainstream. As a company, in fact, they're practically forbidden from showing any personality, because it goes against their message. That means they've got to side with the masses, give people what they want, and generally dominate the mainstream, because it's what's expected of them.

My point is that Apple's aware of that and does what it can, little as that might be. They use indie music in most of their commercials, promoting an artist at a time (though never anything edgy), they offer free promos of musicians, though not many. That's all they can do. There are thousands of indie artists, Apple can't show them all off, and to be honest most people don't care about them. They care about Maroon 5, because Maroon 5 is easier to swallow.

iTunes isn't trying to make a statement. It's trying to reflect popular opinion. I wouldn't doubt Apple would be glad to be able to show off something more diverse, but our culture isn't diverse and so Apple's not going to do a thing until that changes.