The fellow BOL's did not respond in time. And now, its been offered to the big wide world of ebayers. I think that you should put it to the late coming BOL-ers that they should bid high on the auction.
Perhaps, if you don't have a reserve on it, add a comment to the auction, that the auction will be pulled, and it will be sold privately it it fails to reach some value at some time period before the end of the auction. Of course, you'll be out considerable sellers fees also, so you may like to add that your calculation also.
That's a decent ethical stance. Legally, as others have put, you aren't obligated to do anything more than pull the auction and sell it privately.