I have thousands of games in my game library, most of which I haven't ever even installed.
I play them as I see fit, which happens to catch my attention at a time. Maybe someone mentioned the game on a forum, or I had a dream about the game, or whatever.
Now I am e.g. playing Freespace mostly, already completed the base game and now playing the Silent Threat expansion. I probably bought that game originally over 15 years ago, and didn't even install it until maybe 6 years ago the first time, and stopped playing back then.
Only last year I re-installed it again (this time the GOG version, as I didn't have Silent Threat with the retail version I think, and I prefer playing the game without the CD).
What after this? Honestly, I don't know, but I am sure I will pick some other game from my library after this. Could be Freespace 2, could be Fallout, could be Independence War, could be Deus Ex... the possibilities are endless!
I am not a collector as in looking at my collection and marvelling at it, smelling the fresh ink on my GOG games etc... Quite the opposite mostly, e.g. I got rid of the game boxes of my PC retail games in order to save space, and also I am not interested into non-gaming content with my GOG games (like soundtracks, videos etc.). I just want the games, in order to hopefully play them at some point.