As others have already explained, it is done to prevent competing services from achieving the number one spot for your search result. There is a very cool and

As others have already explained, it is done to prevent competing services from achieving the number one spot for your search result. There is a very cool and informative video from Google that shows what goes into bidding for and awarding the ads that are shown. I had truly encourage you watch this: http://m.youtube.com/watch?v=PjOHTFRaBWA http://m.youtube.com/watch?v=PjOHTFRaBWA