I have been releasing books under Creative Commons for 20+ years. Share alike, no modifications, no commercial reuse. I sell my books via Leanpub (my books https://leanpub.com/u/markwatson) and they can all be read free online (recommended to see if you like them), and if purchased the price can be reset to free, zero cost.

I like CC because I like my books to be read and I still make money. When people choose to pay I use that as a signal for which topics to put future effort into.

My wife has been my editor for ever, so this is a family business.

EDIT: over 20 years ago, I was what I think was Larry Lessig’s second ‘Featured Commoner’ and that was fun because they interviewed me and posted the interview in the CC web site.