After comparing with other sites I came that it must be making around 10 million dollars per year. What say.
Its really hard to say, I have family with an alexa rank close to 100,000 he makes an average of $20,000 dollars a month. However he has very good affiliates and doesn't use ppc. I would say that your estimate of 10 million is quite reasonable.
He hasn't been earning that for very long now, I don't think that he has even begun to figure out taxes, also he likes to spend it, I fear that when it comes time to bite the bullet and pay uncle same he is going to have some serious trouble.