Think of advertising as oil and Google as one big emirate. What happens when the oil runs out?
Maybe it already is. Citing a “Natural Born Clickers” study by ComScore and Starcoma, Ad Age last year reported that “the number of people online who click display ads has dropped 50% in less than two years, and only 8% of Internet users account for 85% of all clicks…What's more, the 8% of Internet users that compose a majority of clicks is also down by half from the last study, which found 16% are responsible for 80% of clicks. The 2008 study found half of all clicks come from lower-income young adults.”
I totally stole this link from Tim Boyd.