I suppose it is better than buying a new full priced version of the same game every year. Imagine yearly DLC for sports games, that could work. Most of it is just to milk the game for more money though. I'm not sure I have ever actually bought any.
When I was a kid, the firs time I saw an EA-Sports genesis game I assumed that the yellow tab was some removable chip that would allow for yearly roster updates.
But really, they just want you to buy the same shit over and over again with only slight changes. The fucking Hawkwind tactic.