Especially considering the fact that there is a warning for beginners that is visible even to unregistered users.
It's unfortunate that you can't even be presented DefaultTrust metrics in boards where trust is visible. It's as if guests are stripped of the mere existence of the trust system until they decide to register. (but why would you do so for a single sale thread?)
I still think this is a bug
Just don't allow topics to move into Auctions without moderator support. ¯\_(ツ)_/¯