Kingdom Hearts? Made by SQUARE and Disney. Although Square is going back to producing for Nintendo as well, the deal was struck after Kingdom Hearts began development as a PS2 only game. Maybe in the future they'll port it to GC, but not for awhile. That's why.
The reason I don't like GC is because all the games are so childish. Sure, Metroid and Mario are classics and IMO, look like they're great games on the GC, but the new cel-shaded zelda looks so HORRIBLE that the reason I wouldnt buy a GC is because I would be associated with that game.
That and because its color is Barney Purple with a purse handle.