[especkman]

I don't think your experiment supports your conclusions.

I don't think your assumption that it only works for dumb searchers is supported, since nothing in your materials & methods suggests that searchers were in your experimental or control groups.

All your evidence supports is that adsense does seem to work for the sorts of people who click on link spam. It may be reasonable to assume, based on their behavior, that those people are dumb. It's unreasonable to conclude, based on the behavior of greedy people who click on link spam, that anyone who clicks on a Google ad is dumb.

Check out the article on ad dynamics by the creator of the Metafilter family of sites that I posted a link to. He has a better reasoned theory about when ads work, and when they don't.

http://news.ycombinator.com/comments?id=25710