(Excerpted from an IM conversation, pardon the language.)
I didn't start out wanting to sell books and give talks.
I just wanted to make cool shit.
Then other people said, "hey, I wanna learn how to make cool shit, too!"
Well, I don't have time to show everyone how to make cool shit, so I'll just write it down or talk about it and then everyone can go off and make their own cool shit.