I have to agree that Auctions aren't a good thing, at least for Amibench.
What I would like to see though is a search feature, so that I could look for say, an a590 without having to go through the listings and possibly miss it.
What would also be cool is a feature whereby I could ask Amibench to email me if a certain item came up, so that in the event that I couldn't find an a590, the ad posting script would scan messages for it, and mail me a link to the ad, giving me a good chance of getting in there before anyone else.
And the ability to edit ads, so if something sells, I can remove it, or mark it as sold, to stop me being deluged with offers for it.