Is it just me or could something simple like this help?
As many auctions for years had phone-in bidders, there was an employee manning the phone. Would not an employee watching a moniter near the auctioneer fulfill a large part of that function??
Maybe not foolproof, but may help.
I think that the house is gaining by attracting bidders that cannot attend (if their bid actually goes through).
However where it is really costing the house and the owner is if the bidder chose to stay home and bid online rather than in person(and their HIGHER bids are not being taken)
Just my 2 cents..