I agree with what the poster said above about the 80's and 90's games being actually rare. Thus holding their value.
We are at a point in gaming now with all the special edition releases that people collect them just to sell them 20 years down the road. Especially those PSP games like Trails in the Sky Premium Edition. But the difference is even though those games are special editions they still have relatively high print runs compared to actual rare games of the 8 and 16 bit era. They will always be available, even sealed, at least in our lifetime because people will always be unloading their investments. When it comes to collecting now if you truly want to invest you need to be collecting actual rare games, not special editions, unless it is a truly rare special edition. Games like Hilton Hotel on PSP, NiNoKuni Wizards Edition, Class of Heroes 2,and other obscure games with low print runs will be valuable. Mainly games that never hit retail shelves. For this generation the rare retail game probably haven't even been released yet. Because they normally come very late in the systems lifecycle.
But back to the subject on Magical Chase. It's expensive because it's truly rare. Even when I owned the game back in the late 90's I paid $120.00 for a copy with a manual, and ONLY because it was listed uncorrectly on eBay as PC Engine Magical Chase.
Truly rare games command high prices whether they are good or not. Not something like Earthbound that is expensive because people like it is totally different. And when you get that game that is actually rare, and good, especially if it is a shooter or RPG people go crazy.
I think I could list the number of truly rare games with official releases on just 2 hands. And they are all expensive. Not counting Neo Geo AES games. pre NES and PC games because I don't know much about those.
Actually Rare:
Magical Chase
Dynastic Hero
Zenki PCFX
Samurai Shodown V Special MVS
Luceinnes Quest 3DO
Amazing Tader gameboy
Bonk 3 CD (Even this I am unsure if I would call rare)
NOT RARE:
Anything final fantasy
earthbound
hagane
EVO: The Search for Eden
Neutopia 2
Little Sampson
Flintstones Surprise at Dinosaur Peak
Magical POP'n
Shantae
None of those games are rare, they are maybe uncommon, or very uncommon. I would go as far as to say they're is not a single rare Super Nintendo game that had a official release. Not even Final Fight Guy or any other Blockbuster exclusives. As blockbuster was plentiful in this era and had multiple copies of every game. I also don't think there are any rare sega saturn, ps1, ps2, xbox, ps3, dreamcast, Master System etc.. games. Not released in the USA anyway. I could actually go as far as to say after the 16 bit era theyre are not truly rare officially released games that hit retail shelves.
There are however games that are rare because they were special releases or unreleased protos
Darius Alpha
Super Mario All Night Nippon
that Uncharted fortune hunters edition
world championship cart
earthbound nes
Star Fox Super Weekend
The bottom line is Magical Chase is expensive because it is truly rare and sought after. Not just because it is truly rare, but because it is also good, and a shmup. If any game out there deserves a high price tag it is magical chase. Although quite ridiculous as it is. I still remember when Circus Lido was the rarest PC Engine game. It was only sold in certain bookstores in Japan, until re-discovered in mass quantities. I remember when that game fetched over a thousand dollars on eBay, before that people paid near equal prices on yahoo japan before it was ever on eBay. Now it's under $100.00 normally. So I am just waiting around hoping magical chase or dynastic hero are discovered and listed on ebay selaed in mass quantities. Probably will never happen.
A rare game is a game that pops up on ebay maybe once a year, then people see the price and unload a few. Usually around Christmas. That's the best time to pick them up. When people are desperate for xmas money, and when people are reluctant to spend too much becuase of christmas coming up