Instead of trying to get in the top 500 of Alexa, try to make a site that converts. Then worry about finding more and more traffic.
You could have an "adult youtube" site in the top 500 and just burn bandwith all day and not make enough to pay the bill.
It sounds to me like you are just trying to make a high traffic site to give away free porn. Instead start smaller and try to entice people into paying to see more.
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