[2022] Bussing / Selling multiple BIS items on AH Confirmed ban-able

The CS agent is encouraging players to take an active role in account safety be wary about receiving gold from sources they do not know; we have always cautioned against receiving gold from random users or mail, and this is still good practice, especially if a suspicious account is sending you an amount of gold that does not make sense.

The second quote suggests that if you are only using in-game systems to sell to (ie, receive gold from) confirmed RMT sources, it is something that will be investigated. If you are using the Auction House regularly, this should never occur.

Neither of these quotes state that regular gameplay or intended use of these systems is bannable, and neither of these quotes say you are guaranteed a ban at any point.

No, you will not be banned for selling an item on the Auction House.