Forum Moderators: open
My take is that people are going to ignore sites labeled sponsored on the search engines and directories more and more.
Although, if you are trying to think about seeing how featured/sponsored listings work, I think google's new adwords program or whatever might be a good try. Considering you only pay for the clicks that people go to your page, rather than a flat fee from yahoo. I am not sure how this works, and what others have to say about it.
I just think that paying for a sponsored listing in yahoo is not worth it. You are going to ideally spend more money than you will make. Depending on what you offer of course.
Just try to improve your search ranking for your keywords. Get some good incoming links.
Because the impressions are so minimal, it has almost become an "ego buy". You see your name in lights, but it certainly doesn't begin to pay for itself.
Check and see if the sites participating in your category rotate in and out each month. If so, it probably isn't working for them.