Dealer Auctions info

[Bxsvx]

Hey everyone i needed some information on dealer auctions. Everytime I read a carfax, I see auto auction, auto auction, auto auction blah blah, then they land on the used car lots. These cars almost run brand new, and I know they go alot more cheaper than on the lots. is there any scams or anything? I know that only dealers can go, but are these cars good? hows the warranty? I heard from 2 of my friends so far that they have a green light on some that say it is fully covered etc. One scam I heard was if you take a dealer, the dealer might have one of his friends bidding on the same car raising the price, but I dont see how that would affect me because I would have a set limit. anyone have the latest info and scams? Thanks!