Several of my games are up a two-tiered flight of stairs with several sharp turns involved in moving them. I've thought about selling one, then I thought about moving it. . . its still here.
Other reasons I keep a game include how difficult it would be to find the title again once I sell it -- I hang onto the ones I enjoy playing that would be difficult to find again.
Games I put a lot of my time and effort into making look nice/play reliably have stuck around too.