The idea I have is short and sweet. We have a shout box now, where we can post ads for up to an hour (and longer coming, I believe). But what happens when Max sells, and your ad is up for another half hour? If there were a remove ad button (accessible only to the original poster and mods for inappropriate content), we'd be able to remove the ads as they lose effectiveness. This would make room for the other ads advertising things that haven't sold, and easier for the viewer and poster.