Proof that Even Evil Has Standards, The Bad Guys will show some sport and allow for other baddies to meet underground and place bids on a Destructive Piece of Applied Phlebotinum or other significant Doomsday Devices. Does not always involve the classic "English auction" (that's the "going once, going twice" sort), instead using sealed bids. More refined. Since slave-taking is a form of villainy, a slave auction would seem to fall under this trope. This is more Truth in Television than many other examples, though, as most slave societies did commonly sell their slaves at auctions.