ralfmon asked: Why older sets stop being printed?

Many reasons, but a few major ones:

1) Magic is a game, but it’s also a collectible. That aspect of Magic adds a lot of important components to the ecosystem.

2) Magic constantly evolves. Players play Magic for a long time on average because the game keeps reinventing itself. That happens in part because things go away.

3) It would become harder and harder to sell new sets if the old sets never went away, and our business model rests upon us selling new sets.