I collect games because I play a lot and never sell so I don't have a habit of watching prices rise or fall. Sure, it's a nice surprise when topics like this come up and I learn something is worth more than expected.
That's seems too high to be real. It's been said that a game is only worth what someone will pay. Anyone can pull a price out of their ass for an Ebay listing, doesn't mean it'll move. Did it actually sell at that price? I'd attribute price fluctuations on people overestimating value then coming back down.
Dunno if this is true as I haven't done the research, if someone wants to play a rare game but isn't interested in the high price do they affect the value when a digital version comes out? The flip side would be when something is rereleased and sparks new interest, does value rise because physical copies are in higher demand? I mean it sounds logical and all.
I don't have the space to keep 20 consoles connected to one TV so I backed up much of my collection using Retropi. I do want to replay classics once in a while but I'm always busy with new stuff. Really? Makes me want to see if mine still do. I have a lot of saves with hours of effort on them. KotR on FF7, fully unlocked Soul Blade and Jet Moto 2, etc.
pricecharting.com uses actual sales from ebay, and amazon to calculate their prices. A game has to sell before it's sale price gets added to the average price.