Generally, I'd agree but considering that I have over 1,400 games and "collecting" is often more than just playing, that's why I'm in the camp of wanting something like a sealed Blue Thunder VHS tape.
There are certainly a lot of games I'd like to play one day that I don't own and, yes, I am the gamer who prefers to play on OG games and hardware when that's an option, however, with over 1,400 games, you don't really need more games to play cause if I did, I was doing something wrong when I acquired all of those games because if most of those games don't have an enjoyable purpose, why did I buy them in the first place.
I mean, my shelves might be about 15% "filler" because I pick up cheap, excellent condition stuff when I find it at thrift shops, or if I buy a lot of games and Madden 19xx is in it, I'll likely keep it because no one wants to buy it but, still, the other 80-85% of my library are very-playable games.
If I have 5 left to get, it's going to be rarer stuff that I find to be really cool for a purpose. It's not so much about acquiring "value" but there's a reason why NWC carts are valuable and it's not just because it's rare. It's because the NWC was probably the coolest gaming "thing" to ever have and owning one of the related carts is about the awesomest thing you could collect, other than maybe a verified original NES and/or PVM they used in the competition. Even with something like that, though, it's not as immediately recognizable for what it was.