I'm fully aware that my GH playing won't translate into being a great guitarist. Guitar Hero is all about rhythm and hand-eye coordination, whereas a real guitar is about notes, chords, hitting the right one, etc.
I'm not ignorant when it comes to realizing the difference between the two. I just prefer GH at the moment. I'm learning a lot about real guitar playing, so I'm sure eventually I'll prefer that.
I agree with the "12 year old" paragraph. I'm fully aware of what musicians do day-in and day-out to fulfill their dreams, etc.
I KNOW GH doesn't make me a great guitar player. Sure, some musicians have rejected GH, on the basis of, "What would this help us do?," but once they saw GH1 sell a million copies, they saw something in the game. That's how they got Aerosmith, Allman Brothers, etc. into #2. And once the musicians find out they can make a profit off the game, by having their song in it, and possibly leading to some albums being sold due to their song inclusion, then yes, it can be worth it.