It's an opportunity cost thing. You could sell them and get some money from it. Do you like having those games and the thought of playing them? Or the idea of collecting one more? Or would you get more enjoyment or use out of the money you would get?

Do you think people use coin or bottle cap collections for anything functional? The point of collecting stuff is to have your own personal little museum to look at and enjoy based on your interests. If you don't enjoy keeping them, then don't, but if you do enjoy keeping them, because of nostalgia or sentimentality or because you just like having physical copies, then keep them, and don't worry about whether they serve a function or not. In that case their function is that they make you happy.

Depends will price go up tomorrow?

Collections add a little something real to an interest. You are into baseball? Collect baseball cards and baseball memorabilia. Some find a tactile connection improves their enjoyment. For some people, it may be old video games, for others it may be coins, stamps, achievements in video games. Yes they are digital, but you can see them in your achievement/trophy list. I think some people are drawn to collections more than others because they favor a certain learning style over another. I'm not educated in behavior in any way so I am qualified to share my opinion on the Internet. There's nothing abnormal about that. The collecting part. Not the part where I have no real knowledge on a topic but I feel my opinion is worthy of being heard. That's actually normal, too, probably. But it shouldn't be.

It your stuff. Keep it or get rid of it when you're ready. There is no obligation either way.

Case in point. I just gave away a PS1 with FFVII and FFVIII, plus a PS2 with GOW1/2, FFXII. We're moving house and I packed the PS1 in a box and then I realised right then, I didn't want it anymore. A switch flicked. Inmy case I didn't want to sell, just give to someone who would treasure them.

If you no longer have a connection to the stuff, maybe free up the space always good to declutter - but don't get rid of it just because you think you should.

There comes a time where everyone has to grow up and put childish things away.