Probably because if you didn't get them when they first came out and they were 1000, they're not on sale anymore. Or something like that. Probably just a consequence for not people who didn't get them at first. (That's the best way I know how to put it. LOL)
if you have noticed in past anything that has been re released has always had a price increase ( ie : princess dresses, sorcerer hat) so this just continues the trend,