We probably all have had our share of good deals, but how about the opposite for a change. Maybe you sold a game for less, or went for less than average... or you traded away a game for much less value, whatever. Post them here.
Mine are all Saturn-related:
Traded back in 2001 Legend of Oasis for Fighters Megamix. Now, back in 2001 LoO was a $25 title or so, and FMM was like a $10 title. Today LoO is more like $10 which is shocking to me, such a quality game. (I eventually bought LoO again, for a measly $5, this past year)
I traded away Metal Slug for Soukyugurentai. MS could easily go for double what Souky goes for.
Any regrets on my part? No. I've gotten my fair share of good deals and every once in a while it's nice to help out a gamer who deserves it.
On the opposite end, I got Capcom Generation 3 in the mail recently. I never wanted WANTED this game, but when I saw it going for 5 bucks on eBay in the last minute, I couldn't help but jump on it. Sad... I saw the seller's feedback and he bought CG 3 about two months ago for a total of $30. I won his auction for $8.51 shipped. Look at the loss in profit there!
OUCH.