Yes and no. It's true this a policy violation, but I can tell you unequivocally that a huge percentage of used sellers on Amazon are actually arbitraging their competitors inventory. As a midlevel sized buyer and seller on Amazon, I've always assumed that these sellers had some kind of secret upper-tier arrangement with Amazon? Because as buyers, we see high volume sellers do things on a daily basis that we would never do as sellers for mortal fear of our account getting banned. Yet somehow these megasellers seem able to muddle on year after year?

A lot of them are not necessarily even primarily e-commerce sellers, but are semi-camouflaged divisions of larger traditional publishing entities - like how the seller oneworldbooks is actually the textbook wholesaling giant MBS Books. These sellers are companies so large they are akin to major new-book publishers, so I assume their relationship with Amazon as a company is cozier than ours is as "random small bookstore with Amazon account".