I've wondered the same thing. How does he combine such extraordinary clarity of thought and expression with humor, street smarts, and yet maintain a volume of output that justifies his claim that he is a "one man global content provider"?
It's probably just immense talent combined with very hard work.
I'll bet that he has caused some aspiring conservative pundits to have serious doubts about their own abilities. I've never read a liberal pundit who is even in Steyn's league.
Sorta like the Bach of punditry?