Forum Moderators: skibum
If none of the advertisers are having success, you might want to use a clicktracks-like tool to see patterns of where people tend to click. Does the placement of the advertisements say, "click us" or "ignore us"?
If some of the advertisers are having success, you could put together guidelines to eliminate worst-practices and encourage best-practices. Also, are the ad formats the most appropriate for beginning advertisers?