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?

[NintendoPie]

Joe the Bro possibly had the best answer in here.

When people finally decide to pick up their Nintendo Console, they'll want in on some of the games that came out earlier for the system. Every year more and more people buy a Nintendo console (obviously) so more and more of their SW titles, especially the popular ones, get sales.