Auction houses still want to try to maximize as much revenue as possible so that's why they would still charge the BP. Also, it may be confusing to some bidders on which lots have BP and which don't. Finally, for some auctions, it's not only the AH that owns the lots, but also some employees who decide to consign their items. For the employees, it's likely that the AH would still charge them a portion of the BP.
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