These size 8.5 Stuart Weitzman "Hilo" black leather OTK boots received 24 bids and sold for a whopping $670, more than the original $650 retail. My guess is because these boots were 1) a very popular size, 2) new with the original box, 3) no longer made by Stuart Weitzman, and 4) a rare combination of all of the above.
I do take a little offense that the seller listed the original retail on these at $938, considerably higher than I've ever seen these sell for at full retail.