I’ve thrown out consoles and all the games I’ve owned (Atari 7800, Intellevision, Vic 20, SNES, N64, PS1/2), but I’ve never sold one. I’ve mostly done it in a move and I didn’t feel like lugging them around. I gave a car away too to a landlord for the same reason. I’ve repurchased an Atari 7800 because I missed it so much, but the others - to hell with em.
But lately I’ve been collecting for my older systems. If I come across an Xbox, GameCube, or Ngage game I don’t have, I usually buy it if it’s decently priced. I must say though, I do miss Stunt Race FX for the SNES.