Hey Nuckin,
Perhaps you could whip up a "How to Conduct Forum Auctions" type FAQ/Guideline.
Forum auctions are great but everyone does them their own way and many of them suffer from this exact problem. They don't list hte top bids/bidders and give others a chance to counter-offer.
Not only does the OP lose out on potential better offers but it also frustrates those involved in the bidding.
Anyways, I do think that would be a very useful guide for everyone. Perhaps it could even include a decent template that one could copy (though I don't know how many others would use it).