Hey Dots,
I don't know what you're looking to do - and if Google will give you what you want - cool..
I turn away more than 100 paying sponsors each year - the advantage of being at the top of my categories in Google or any sort of ranking - but for the 30-40 paying sponsors I do accept for my forums, I do it very simply - a banner for each page, using very simple html / js inserts.
Take a peak at my forum - you see how I do the banners (forums grouped and multiple sponsors share the forum groups) - my revenue is based simply on what I want to get each year - which is why I limit the number of sponsors, but the limit also helps, because with the massive waiting list, I have few hassles..
Let me know if you are interested in my super simple way of displaying banners..
Bob
