Kaneda would never start a thread without relevant experience or insight to offer - I'm sure he's had his LOTR on the market for months but just cannot find a buyer.

All fair enough. Someone that mods the hell out of their games either won't be selling to you (and so has decreased their buying market by a decent chunk since there are others that feel as you do), or will have to strip the mods to sell to you, or leave the mods on and just write them off entirely. Of course if they're desperate to sell they may go with one of the later two options, and if you're desperate for a particular title you might buy it and pay something extra for the mods, with the intention of stripping them off and selling them to recoup some of your costs.

I'd bet most buyers are somewhere in the middle -- they like specific mods and would pay more for a game with those mods installed, but heavily discount mods they don't care about. In the end it's just one more basis for negotiating the sale price.

Ok, but did you do that for every game you sold, or just some?