You should take a look at game prices for anything older than PS2/GameCube (and even some games from that era are obscenely expensive). For a long time, LSD: Dream Emulator was one of the most expensive games you could get at around $200 for a pristine copy. Nowadays, there are a ton of games that are >$200 for a junk, beat-up copy. The price skyrocketed thanks to WATA/Heritage Auctions doing a lot of suspected pump and dumping that, as a couple examples, got an LoZ copy sold for nearly $900,000 and a copy of Super Mario Bros sold for nearly $700,000. Afaik the only known copy Chu-Teng didn't sell for that much, and that was considered to be lost media.
Even if all you want is to have a copy of Banjo-Kazooie then have fun forking over $20ish for a loose cartridge or >$100 if you want the box and manual. That's not how it used to be. Used to be that you could get a loose cartridge for like, $2 in a bundle of 10 of them.
Fuck WATA.
Edit: this also applies to old computers. Remember when you could get a beige CRT by the side of the road for free? Have fun paying >$50 for a shitty CRT, >$200 for a decent one, and >$1000 for a good one. It's not just CRTs either; basically anything to do with old PCs is becoming obscenely expensive as well.
U.=.U