According to a recent marketing study, people who use Google as their primary search engine "tend to be richer and have more Internet experience" than folks who slum in the other search engines. No word on what it does for your hair's body and natural sheen. It also doesn't necessarily work in reverse. Switching to Google has not made everyone wealthy. Buying Google stock at IPO, sure, but not switching to Google's search engine.
The study goes on to say that the longer people use the Internet, the more likely they are to start using Google. Presumably this would be because they are crushed under the weight of pressure by the media and bloggers. It could also be because it works so damn well.