I like the idea of cutting out auction spam but I don't think the command should stop you knowing if someone has outbid you. That's the kind of message you need to know!
Honestly, "auction spam" is more or less just a bidding war between players whom wish to win the auction - It isn't like regular chat spam which is frankly unnecessary. If you don't like seeing the constant bids in auction, you may leave the auction channel.
