I am sure some of us have a small selection of duplicate games. Recently, have you sold them or have you decided to keep them as backups?
My spares came about because a lot of (long dead) local shops never gave adequate trade credit and I decided to keep a great game (say, a complete Revenge of Shinobi) instead of bartering for $2.
I ask because I have a few rarities, the problem is that some of the CDs are rough or the carts are loose (or loose with a torn cart sticker). I also have some spare systems that I could use to create a bundle/lot at auction.
For example, Popful Mail CD. I got this when local shops were selling loose copies in scratched-poor condition for $60-$70. This one was advertised as 'book and CD inside folded insert' in a text only BIN auction in the early 2000's. When I got it the front of the manual had a rip from the center-top to midway down and the 'folded insert' turned out to be the back of the original box insert-sans both spines. I added a real Sega CD case and it was my main copy until a few years ago; I never hated the condition and I considered it a deal as I got it complete (but rough) for the cost of a loose disk. I also ran the CD through an expensive resurfacer, but there is a spot on the disc outside of the data area that did not come out; nothing that affects the playing of the game since there is no data in that area.
I have a few other games just like this one: Flashback CD that plays all the way through but crashes at the very end of the demo movie. Pirates Gold! that is a loose cart with no label. King of Casino, a complete copy of Keith Courage, etc, etc...
Are they better off with me, since I do not mind the condition problems as long as they play as a backup? Should I pack them in a box for the next 20 years? Should I try to bundle all of them with a system and detail every little thing that's imperfect with them at auction? Keep them for family vacations and traveling?