Tons of visitors using up bandwidth, but no one clicks on the ads. Have you ever clicked on a Yahoo or Facebook ad? If I want something, I will do a research it on Google. I often click on Google ads because I am requesting the info. If Google, Facebook, or Yahoo throw at ad at me, I will not click on it, even if I am intrigued.
I just clicked on a facebook "suggested post" accidentally. Kudos Facebook. You fooled me into thinking it was a friend's post. The text "suggested post" is greyed out so you can't see it from an angle. How annoying.