I'm not sayin'!
But I've been through 5 guitars (GH2 * 2, GH3, RB1, GHWT), 6 different games (GH2, GH3, RB1, GH:A, GHWT, RB2), a metal kick pedal for my RB1 kit (including fixings to patch it in), a Roland TD3 e-drum kit, upgraded drum heads, an interface kit b/w the TD3 brain and the Xbox360, and a mounting plate for this interface. Oh, and an awful lot of DLC.
RB is far and away the most expensive 'game' I've ever played but it's also the most satisfying. It's not about the total cost thankfully. I've not regretted a single purchase thus far.