There's a big difference between Google's AdWords and other advertising (including Google's AdSense). I universally oppose all advertisements (in the seconds sense), I even think that billboards in public should be banned. Advertisement like that is just pollution of the mind. However, However, I don't consider AdWords or bulletin board ads "advertisement" in the same sense of the word, because it's just showing you something you already want to see. If I'm searching for upcoming concerts, I want to see information/ads about upcoming concerts :)