I always wondered that. For example I don't make more than $ 100 a month, of several blogs. But I heard that other blogger make a lot of money with their blogs. How they do that?
Whether they use AdSense, Amazon or other affiliate program, they have a lot of reader, and some of them win sufficiently to live by this job (blogging).
I wonder: what is the secret?
And I answers: knowing well the internet opportunity.