wow...2 millions $

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hi... Now i find out that youtube have 200tb traffic/day and They spend a lot of money (around 2 millions $) for this site... Still others ask hard questions about YouTube's business model and long-term prospects for survival... On youtube can find a lot of new movies trailers or old movies that made the history like Gone with the wind or some old music like Beatles... I think that they have this money advertisement...but i am not sure...can someone explain me this phenomenon YouTube?