Cool, congrats, and thanks for the writeup! I just bought your book on Amazon though I'm a fellow Leanpub publisher...organizing non-Amazon documents on the Kindle is just a pain. I'm assuming publishing to Amazon was pretty straightforward since Leanpub generates a mobi version? The paperback fees/revenues don't seem too promising...I'm going to take that as another excuse to never publish on paper.

Another datapoint...a few years ago I published a draft manual on how to use regular expressions. I've never finished it, but to date, I've accumulated $1,200 from Leanpub revenues...even though I set the book's price to $0. Once I have more time I'll finish it up...I was pleased to see that Leanpub made the publishing workflow even easier by hooking into Github...I've been trying to set up a system that simultaneously publishes via Leanpub while publishing a free web version using the same files via Jekyll.

tldr: Leanpub is great...I haven't used other self-publishing platforms but I can't imagine how much better something could be than Leanpub for those who like hacking/writing in Markdown and in their own text editors.