Well I didn't says they were a waste, but Gamecube was the system that got the least attention I mean GTA was for only PS2 and XBOX they didn't consider gamecube same goes for a lot of games, but I guess you're playing them for the nintendo character games like Mario, Zelda, Star Fox, F-Zero, Zelda and Metroid.
You'll save money on batteries because the system's controllers are rechargable, and the 6oB is the only one for anybody, you lose too much in the 20B whatever GB means no one knows.