[QUOTE=Big Bad Voodoo Lou]
When my brother and I sold our old NES and SNES games on eBay last year, we made the most money for the RPGs: Dragon Warrior I-IV (big bucks for IV), Ultima: Exodus and Quest for the Avatar, Final Fantasy I for the NES and II and III for the SNES (the Japanese FF IV and VI), Chrono Trigger, and Super Mario RPG. Our original Tengen Pac-Man (the unlicensed NES version; a black cartridge) went for a good sum as well. We cleaned up on those games, more than enough to offset the ones that didn’t sell for as much. Of course, it helped that we had saved all the manuals, maps, and strategy guides too. Those sorts of games will always have an audience, I think.
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One of the strongest reasons for this is because RPGs aren’t typically about the graphics, they’re more about the story and the type of gameplay. There’s not a huge functional difference from one Final Fantasy game to the one on the next generation console - sure, FF1 is very different from FFXII but many of the major components of FF games were established early in the series. Likewise these are mostly members of known franchises - Final Fantasy and Ultimate, and to a lesser extent, Dragon Warrior (and of course Mario games). Plus, among the RPGs, these were the “good ones” – the ones that stand the test of time.
However, the truly rare and expensive ones aren’t in your list. The really expensive ones tend to be horribly small releases, unlicensed games, that sort of thing – like “Action 52” on the NES (which is atrocious but rare and valuable). There are approximately half a zillion Final Fantasy and Dragon Warrior cartridges, but demand is high enough that there’s a brisk trade. That doesn’t make them rare, though.
Sometimes games come out with a limited release and then are more popular than expected, usually because the gameplay is above average. Hence why Katamari Damacy no longer sells for $20, and why Disgaea and Final Fantasy Tactics (before re-release) sold over their original sticker price.
Rarity isn’t always associated with value, though. I was reading a rarity list for NES. I have a couple “A” rarity games but they wouldn’t be the highest selling, but I don’t have anything earthshattering (sealed boxes of rare games, really difficult to find unlicensed stuff, etc.).
The most rare and sought after vintage games are unreleased games and prototypes. Believe it or not, people have found cartridges of unreleased games in places like thrift stores. Having the only copy (or one of a small number) increases the value significantly. Even if the game itself really sucks.