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> did they self-publish or went with some known publisher?

My former boss self-published a book on Leanpub. For the "known publisher", I'm a little acquainted with the author of "Docker High Performance" (Packt).

For the leanpub one, it was organically easy to get the word out through local meetups and clients. Packt reached out to the "Docker High Performance" guy, he reviewed a few books for them then they emailed him.

> What kind money can you make on ebooks?

For the people I mentioned, I can't say. But if you do get a good book out with a good following you can hit Nathan Barry's numbers:

- http://nathanbarry.com/app-design-stats/

- http://nathanbarry.com/designing-web-applications-2nd-editio...