Rusty Brick gives us an arguement on why Ugly Sites Earn More With Google AdSense. Basically he says that “people land on the site, and immediately want to click off. They find the nearest ad, and most attractive part of the page, which happens to be the AdSense ad, and clicks off. Phew, they are saved and they move on to a real dating site, that is both professional looking and functional.”
Taken from here.