I still have a fairly big collection of games stored in the garage, half of which is on display on a bookshelf and half is stored in plastic boxes. I bought most of the games because they were cheap and generally because the game was something I wanted to play, or it was well regarded. This means I have a large backlog of stuff I haven't given the time it deserves. But it's nice to have them there when I need/want them. For example, this week, whilst reading about the new Igavania title, Bloodstained, I thought to myself "I have four Igavania's in the garage that I've barely touched" and so last night I set up the Gamecube with the GB Player and played Circle of the Moon - it was very enjoyable. It's nice to be able to do that on a whim.
I don't really buy old games anymore and anything I don't enjoy will get sold, so the collection is only getting smaller as time progresses. I used to have a collection of very good/mint condition SNES games (the console of my youth), but emulation and the SNES Mini, not to mention the high prices they sell for mean I have only a few left, and I suspect only a couple of those will stay forever due to nostalgia for the physical item itself, not just the game. I have already been trying to thin out the collection. RPG's are the first on the hit list - haven't played any to completion since FFVII, and that was my first! I am also looking to offload duplicates or titles that have had an HD update or similar.