I made about $19K on about 9000 sales of the first edition of my book published with Apress at the point I wrote that (many years ago). Since then, I've written 2nd and 3rd editions with diminishing returns each time, but even now over 10 years later it's perhaps $1000 a year in residuals.
I made about $19K on about 9000 sales of the first edition of my book published with Apress at the point I wrote that (many years ago). Since then, I've written 2nd and 3rd editions with diminishing returns each time, but even now over 10 years later it's perhaps $1000 a year in residuals.