So the year they were wrote (first book came out May 2015, second book in Dec 2015), I made $15k profit. Mainly because I did two Kickstarters for the books + the launch campaigns. Of course, 2015 (and a bit of 2014) was when I was spending time writing/designing/editing/publishing the books, so "profit" would be lower if you include my time.

This year, other than answering questions on my book's discussion forum as well as running a couple workshops for PyCon and DjangoCon, has been largely writing-free so it would truly be 13k in profit. :)