20% is pretty standard these days and I don't think there are too many people who would avoid doing business with an AH that charges 20% as the BP. The BP shouldn't matter at all to buyers (you just factor it into your bid and bid accordingly). If it keeps consignors away, then that is a problem, but it sure seems like the AHs charging 20% are getting some nice stuff lately.
And, if you're doing a live auction, I really don't think anyone would expect you to do it for 12 or 15%. I could be wrong, but I would definitely expect 20% or more because you're offering more of an experience and I would assume you have higher costs.
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