I've said before (The W) that I don't think online gaming is all that important to the current crop of console's sales. Here (gamesarefun.com) is an editorial that agrees with me. I'll concede that some of the points sound like whiny complaining (its too hard/expensive to set up a home network), but they are all legitimate reasons why its only the hardcore gamers pining over any lack of online content, and not the gaming masses.
Well, people pay for stuff in Second Life and other games with real money, so buying new clothes for your avatar on your XBox isn't too much of a stretch. I can say that loading Fable II on the hard drive makes the game run much, much smoother.