no one said the bids were going up in $100 increments, if the final live bid is $500 and the highest "silent" bid is $1,000 the "highest" bid, $1,000, wins. The silent bidder does not have the option to 'raise' his bid. He is in for the end result. On the other hand, the live bidder has the option to increase his edge if he/she wishes. Thats the best I can do.