I think the Set/Individual format really does a card like this a disservice.
Boxing is a niche, and the Graziano is a card that will attract non-boxing collectors who don't really give a poof about the rest of the set.
Then again, it's also one of those types of cards with pretty wild price swings every time it's offered. It all depends on who's in the market for that particular card at that particular time, in that particular auction format.............just like most auctions.
So, in summation. "I don't know" is probably the best answer I can give.
