This title, possibly, has a few things going for it. It is to be the last official MVS release, people only need to look at Final Fight Revenge to see that it doesn't matter if a game is good or not, if it is the last on a successful system it will be desirable and expensive

Fact two is, this is a highly anticipated release from a highly thought of name brand. The SS games have lasting appeal, and although 5 was a bit lackluster (albeit still good) SS5S corrects most of the gripes and release a solid final chapter for the MVS.
Will this game stay at $500? No way in hell. Sure this is a highly desired piece of software by collectors, but there is more than enough to satisfy the demands of the MVS people. Arcades will burn this one for a few more months than move onto the next big thing (not that I am implying SS5S is considered big to them in any way, shape, or form). The true collectors will have the home cart, which shouldn't be in short demand at all, and I see the MVS hitting a nice resting place around $100 in the next year and a half. MVS does not and will not hold its value. Look at some of the top older Arcade boards (all across the industry), hardly anything warrants a $500 price tag, and those that do are much more rare and obscure than SS5S.