Bidder is missing crucial information that may help decide if player should bid on a item or not.
In the bid window there should be info about:

1. Current DKP
2. If we do not allow negative bidding player with <0 should get information that they are not allowed to bid and their bids will be rejected. Also bid buttons should be grayed out and disabled.

I plan on developing those changes after MAX DKP change #288 is done