michael_nielsen

I suspect few of those countries would see the book with conventional closed-access publishing.

An interesting benefit / drawback is that dozens of translations have been begun, but many not completed. I make no attempt to keep track of them, but a few include Japanese, Chinese, Russian, German, Portugese, and Lithuanian(!)

I don't keep close track of the monetary income. I made about $9k from the initial Kickstarter, and $10-$20k more in donations since.

If I'd understood better what I was doing I could easily have doubled or tripled those numbers. But it wasn't about making money -- it was a hobby/curiosity project that was about developing my understanding of a subject I find fascinating. The money has been a nice bonus.

An unexpected personal benefit has been a steady flow of Paypal donations through my inbox, often accompanied by thankyou notes. You better believe I read and appreciate them.

Dozens of people have told me the book helped them change careers.

Would any of this have been possible closed access? Of course some of it would have. I might have made more money. But on nearly every other metric, I suspect being open access was a 100x or more multiplier on the impact.