Want silent bidding to be fair? Take bids silently; then once bidding is closed, the winner pays 2nd bid + 1. So, taking the above example: A bids 40, B bids 80. Bidding is closed, so B gets the item for 41 points. Both players bid what they felt it was worth to them, without trying to game the system. This approximates what would naturally happen in an auction: the winner is the one willing to pay the most, but they'll stop just after the 2nd place guy bows out.