The simplest thing would be to take the % out of the overall sale price, like eBay, but then that % of people who either miss the BP or cannot do the math to factor it into their bids would not overbid. Multiply that by thousands of bidders a year and the advantage to the house is apparent.
FWIW, I bid on some cheap HA lots tonight and the system noted the $29 BP on the bidding page, so no mystery there.
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