As Guitar Hero's catalogue of downloadable content grows larger, it gets harder and harder to make a buck selling the older stuff individually. So...what about a subscription to the whole service instead?
It's something Red Octane and Activision are thinking about, RO's founder Kai Huang telling the Seattle Times "[a monthly subscription is] definitely one of the things we would love to do. There are a lot of issues around music licensing. Consumers want it; I know I want it. We're trying to make that happen."
Keep trying! And then let Rock Band copy it. Then make it $10 a month to access the whole catalogue, albums and all. Then come get me.