making money advertising other peoples websites?

How does that work? How is that possible?

This guy claims that he is a google recognized adword professional. He claims to be making money off other people websites by advertising therm through ad words.
http://www.googlemoneypro.com/moreinfo.htm

How is that possible?

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Niche Affiliate Marketing | I make $15,000 a month with PPC marketing and so can you!