The legitimate wholesale ones require you be a licensed dealer to bid. You can bid under someone elses license, but they have to be there and do the bidding for you. They are starting to open up these so called wholesale auctions to the public for a fee. They have sort of prostituted these as wholesale auctions but they are often times not. Often times they offer what the wholesalers didn't bid on.
I will give you an example I almost jumped on. Had I known the bike better and know what parts were going to cost me I would have jumped on it. 2011 Kawi ZX-10. Not minor but easily fixable front end damage. 2800 miles. Needed a front nose, dash, a radiator, side plastic on right side, front forks, rim etc, mirrors and other minor bits. Started and ran with no issues. Went for $3200. If I knew what the parts would have cost, I would have bought it at that price. Parts could have cost another 3K for all I knew. But part it out and you had a 5K bike there.
Track bikes are easy to find. They lose the plastics, the kid doesn't have the 1.5K deductible, so it gets totaled. Insurance companies dump a bike that has been in pretty minor accidents. Theft recoveries sometimes come through as nothing but a frame. Other times they look complete with not much wrong with them.