Why does ads pays you so much money?

I mean facebook become successful because of ads,Youtube pays you because Google is popping ads in your videos,TV shows has commercials,and that guy who invented flappy bird make 50k a day because of in-app ads. Its just a ******* ad,its not like people will buy your product when they immediately see it. Sorry If... show more I mean facebook become successful because of ads,Youtube pays you because Google is popping ads in your videos,TV shows has commercials,and that guy who invented flappy bird make 50k a day because of in-app ads. Its just a ******* ad,its not like people will buy your product when they immediately see it. Sorry If this is somewhat a noobish question XD
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