So it's widely known as a fact that many Nintendo games have ridiculous legs. But here's the question that no one really bother to ask...why is this so?

[Jumpin]

That's easy. First party Nintendo games are almost always one of the primary reasons people buy the console. This same sort of thing happens with all top consoles, it happened with the PS2 and GTA titles.

Gran Turismo, I think that situation is a little different, the game CAME with the system. I don't think many people actually wanted that one since you could get them for almost nothing at pawn shops. You can still go into those shops and see them available second-hand by the dozens.