I assume that those dealers who "flipped" books from the Berks auction, weren't so much flipping, as filling long standing want list requests from existing customers (especially those who are internet/auction averse and thus wouldnt be bidding on the CC auction themselves). We're those resold books every actually listed for sale, or did they appear on the dealers site as sold from the onset (Im betting on this). Cause otherwise I dont understand why someone would have the internet knowhow to buy a book from a dealer's online marketplace, but lack the ability to bid in an auction.
Unless the buyers were buying with dealer credit (thus meaning they couldnt actually bid on a book, but could buy it from the dealer with whom they had credit).
Or the buyer was offline during the auction and asked the dealer to try to win on their behalf and then paid an agreed "markup"
Or any number of other scenarios...
Lots of these larger dealer sites have "want list" functions, so they could have just as easily bid on books that they had multiple "wanters"for thinking they could then set the price they want and offer it to the 1 or more customers who had it on their want list.
personally none of it bothers me, but it is entertaining to consider the various machinations.