retro gamers like playing on CRTs, i've learned. i sold a PS2 a couple of years ago, asked 20 quid for it, not realising that i probably could have asked close to €100. the guy who picked it up even offered me €40 for it, he couldn't believe his luck.
I once had two lightmeters (i.e for photography) - one a basic, old fashioned, but useful one with the discs on the front to work out.
the other a proper polaris studio meter.
when I put the latter up on adverts, I mixed up what I had paid for it with the cheaper one, meaning the eventual buyer got a serious bargain!