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AK Pig Of The Hut
Just spitballing here and it's quite a while before the end of the bid but if you want to remedy this problem I suggest finding everyone who's interested in representing a character by a certain date. In the last week of bidding, the characters in each respective tourney that haven't been bid on in x number of days, lets say 3 days, those character representatives should be asked if they want to increase their bid. If there is no further interest in increasing the bid, the character spot should be closed out. This will give each bidder a fair chance at betting on their character without getting their spot swiped by someone waiting for the last second to bid. It's a little more work but it's just a suggestion to potentially fix that problem.