Why me? Well, I've only played Guitar Hero for about 5 minutes at a Best Buy kiosk and need the game to actually get good. I've played previous games by Harmonix (Karaoke Revolution, Amplitude, Frequency) and seriously appreciate them as a developer. Friends of mine have GH1/2, but because of my limited 5-minute experience with the series ever, it pains me to not be an expert participant with the game. That's about it. Oh, and I'm cheap and still can't believe Guitar Hero 1's hard to find under MSRP or at a good used price, so free would be pretty nice.
Besides, I have an old PS2 demo of Guitar Hero II sitting here just begging to be played, and the guitar would sure come in handy for that (with all the GH1 songs to boot).