Quoted from usandthem:As for the Color DMD, I'll definitely cede that point. But even so, you can't tack on what it takes to purchase a new one to the value of your game.
You sure can. Used ColorDMDs come up for sale rarely, since they either go with games or are removed and swapped into another game. When they do come up for sale, they don't go for much of a discount off MSRP. Your point holds for most other mods, but not for ColorDMD.
Signed, a guy who spent six months hoping to score a used ColorDMD on the cheap before accepting how that market works and just buying new.