I bought a SNES for Super Mario World, a PS2 for Gran Turismo 3, and a Gamecube for Wind Waker. Lots of folks buy a console to play a particular game, but I mean I bought these consoles for those games in a strong sense: I would not have been disappointed if those were the only games ever made for the system. (Though in all three cases I went on to buy other excellent games, in fact ones even better than the initial impetus to purchase.)