Even playstation games are going up. A few years ago, every game in the crash bandicoot trilogy (except maybe 3) was worth about 5 bucks around here. Now they're 15 apiece. Same with Spyro. Again, games with a TON of copies available, so much so that they reached greatest hits. It's all in the demand. Since it's such an RPG monster, too, those have always had value. It doesn't seem to be climbing as fast as the SNES by any stretch for the majority of titles, though; the obscurities in its library that are good but not notably rare are still cheap and available, as well as a fair number of the big hits, such as rayman and tomb raider.