The worst case is just that you get outbid.
The Trader's Hall in the Valley of Honor – run by Auctioneers Drezbit, Kuvi, Vizput and Zilbeena 1.2. Again, there’s some disparity between the cut taken by faction and neutral Auction Houses, with the faction cut being 5% and the neutral AH cut going all the way up to 30%. When you successfully sell an item on the auction house, the house will take a percentage of the winning bid as its cut.
The Time Left: the time left until the auction expires.