I try to plan so that there's a little comfort margin between my max bid and the bid I figure I'll have to overcome. In one auction today I saw a competitor whom I've faced (and lost to) several times come into the bidding. I adjusted my max bid upward a few pounds and let AS put the bid in at 8 seconds left. Whew! My adjusted bid was exactly enough to outstrip my rival's bid, placed 18 seconds before close. Since his bid was 44 pounds more than the previous high bidder, he must've felt pretty comfortable for a while there.
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