Any other site than Google Adsense?

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Is there any other better site than Google Adsense anyone knows that pays for advertising. We know google pays for placing the Ads on own webpage, blogs etc but find it very difficult for the person to make money from since many people complain that their account been suspended for no reason. Even they does not respond if anyone write or enquire about the suspension of account. Why there are so many people creating and selling ebooks on Google Adsense? Why many people do buy them?Is there any profit or worth buying such stuff?