i've always wondered about these things...and whilst i'm sure there are some legit auctions that offer this stuff, that site seems a bit dodgy to me...
i did a search for BMW and typed in my local area code and it came up with 281 BMWs in my area (i'm in Woodstock, NY, not that many beemers here). I figured it may be a wide search area, so i used an NYC zip code...same number, 281. fair enough, then i tried a Las Vegas zip...guess what, 281 BMWs "in my area", exacctly the same list of cars too.
take from that what you will 🙂