The seller is a reputable trader, I've purchased from them several times and got exactly what I expected and a little cheaper than I could buy it for here in Brisbane. Where is the evidence that he's involved in any sort of scam? The seller's description states "High Quality Content by WIKIPEDIA articles!". How much more disclosure would you like? There's enough there to scare me off, and I'm sure it would discourage most others as well. If someone still buys after reading that then there's no one to blame but themself.
While I don't like the publisher's business model I see nothing illegal, or even unethical, about it, particularly if the source of the information is disclosed.
The seller, on the other hand, is simply a retailer and like all retailers he's entitled to sell whatever he thinks will make him a legal dollar. If you look at the way the seller works you'll find that for the specialist books he only orders a copy once someone has ordered from him. He's providing a service at minimal risk to himself - nothing wrong with that.