Yeah I sell stuff at top dollar all the time.
The way I look at it is this: If I didn't have this right now, would I buy it for current market value? If the answer is no, I sell it. I do this with games and anything else that is resellable (I actually do it most with guitar gear).
The price I sold my childhood copies of Chrono Trigger and Vampire's Kiss for paid for dozens of other items I wanted. Like, would I rather have Chrono Trigger, or the RGB modded PC Engine Duo RX I bought with half the proceeds? Or in Saturn terms, one Batsugun, or ten other great games?