Is any one of you are using google adsense as a business?

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Is any one of you are using google adsense as a business?if so how many hits are you getting on average to your site? how much have you earned so for?and also please tell me the ways in which you promote your site. i have been doing this business for the past three months,but have earned only $15 till now. have any one of you got paid? i have been trying to find the right formula for a long period of time but didn't exactly find one. so i think my lot would help me out.