Comment by WoodenChair

I'm not in any way trying to diminish your accomplishments but just writing a note of caution to those trying to replicate your success before they plow a lot of time into writing a book: Jordan is a talented developer who has 27K followers on Twitter, who I imagine largely follow him for some of the same things that are in his book. He had a natural audience to market to (I imagine he had less than that a year ago). If you don't have 27K followers already interested, you may not be as successful with self publishing.