...You can always use your old GH1/2 guitar, and just snag a copy of GH3 w/o guitar.
In many, many, many people's case, there are so many people that only get to play GH1/2 at a friends house, and many many people out there want GH, but due to the insane price, aren't able to addopt. Only 5% of the PS2 userbase has a copy of GH1/2.
Trust me, Guitar Hero US = Brain Age Japan. Only difference is GH is 3x the price, but revenue wise, they're the same. If GH was...oh....$40 USD, it probably would of hit 10m in the US alone.
I hope to pick up GH3 and an extra guitar at some point. I have about 10 kids at my church asking me to buy it so they can play it.
Back from the dead, I'm afraid.







