When I was a kid I had a crazy lego collection. I had a huge barrel full. I wanted a Nintendo NES, and my dad told me to get rid of the legos first, and they'd get me one. I GAVE them to the neighbor kid. Ever see what vintage legos sell for these days? I could have bought a small house if I sold them now.
Same with the NES. I was a major collector of all types of video games. I had 400+ nes games, about half were complete. Now, I did wait until adulthood to sell those, and I made good money. But I still should have held out a few more years. Most are worth about 4x now. Some rare games go for crazy money. I had "Flintstones: Surprise at Dinosaur Peak". I sold it for $275 and was elated. Look on eBay now, one just sold for $750 for the cartridge alone. Oh well, heh. No use crying over spilled bank bags.