I owned a couple NES games before getting a NES. I used to take them to my friends house to play. I knew I would get on eventually, lol
I also bought a few PS3 games (Holiday clearance) before finally getting a PS3. I also knew I'd eventually break down and get one.
I currently have 1 sealed PS5 game that I bought dirt cheap, though I have no intentions of getting a PS5.
Digitally, I have almost 2 dozen XBX/S games (Usually acquired through cross buy) despite not knowing if I'll ever get one.
I have 1 sealed PSP game, 4 sealed Vita games, 4 sealed PS2 games (+2 used), and 4 sealed Switch games. I don't have, have never had, nor do I expect to ever own any of those systems. They were picked up super cheap and I figured I'd rather have them just in case (I was hoping to get a Vita once upon a time, but not happening now)