Ever since auctions started, auctioneers have started the bidding and run bids to reserve whether a car auction or something else. Its how the world turns and is covered in the terms as 'bidding on behalf of the vendor' and is only done up to reserve.
If only genuine bids could be taken think how long it would take and how much time would be wasted with offers miles off what anyone would take on hundreds of cars.
We might nick the odd one but it would be unworkable day after day.
Everyone knows the rules and looks to make it work for them, both sides of the rostrum.