You should have chosen an unbiased source to prove your point.

http://www.iab.net/about_the_iab

"The Interactive Advertising Bureau (IAB) is comprised of more than 500 leading media and technology companies that are responsible for selling 86% of online advertising in the United States."

Aside from anecdotal evidence (your returns of 15:1) I haven't found any long-term studies done by independent researchers that prove internet advertising is any more effective than other forms of advertising, if it's effective at all. The only real accomplishment internet advertisers can lay claim to is training the general population to never even glance at the left / right / top / bottom navs on a page.

In general, the poll results and comments in another recent thread on HN on ad blockers (http://news.ycombinator.com/item?id=3324709) seem to support my theories about how ineffective internet advertising is. I'd be interested in seeing some untainted long-term research on this subject.