The BTTF shoes pretty much transcend the sneaker collector, and are clearly more intended for the replica movie prop collector. That stuff is notoriously expensive. The fact that it's actually functional doubly so. There's a LOT of great BBTF props out there, but this is probably the only one that works anyway. I'd say, now if only Mattel can come up with a working hoverboard, but considering the shoddiness of some of their products, who would want one?