I've redone the list (page 3). I'm kinda having fun with this thread, if you can't tell. Anyway, I've decided to more strictly adhere to the 'must have sold on eBay recently' rule. I think that focuses in on games we actually have a good shot of finding in the wild. I will make exceptions if given some firsthand accounts that it does show up with at least some regularity. If you don't see something you've recommended, that may be why. Another possibility is that it seems a lot of things have dropped in value, and stuff worth less than about 15 bucks I don't think should be on the list (unless it is a game I just love to death ).

Here's some that I had to take off (or didn't put on) since they seem to be too scarce:
Afterlife
Akalabeth: World of Doom
Alter Ego
Commander Keen (any? Boxed full versions)
Jazz Jackrabbit (CIB, not '2')
Knights of Xentar (?)
Lula the Empire Cums Back
Man Enough
Mystery House
One Unit Whole Blood
SimHealth (?)
Spellcasting series
Ultima IX Ascension: Dragon Edition
Zork (original CIB)