Not enough people are advertising the site I guess. Either that, or people just don't want to participate.

I'm thinking it could be interesting to have a reverse style bubble, where the last advertisement is on top, and pushes the others down. So whoever has the last bid gets the most viewed ad. Could also make it so new bids only reset the timer if they are greater than or equal to the previous bid.
Not real sure right now, some ideas are floating around. If I get enough ideas I may create a site :-/