I am also missing the point here. Why do you need 10 Bitcoins to make it public domain. Is that a theoretical figure you placed, on what you would have earned, if you sold the book?

Rather put the book out there and try to sell it or get donations, the last option, being your last resort or is this already your last resort?

Well anyways, I will consider it, but I do not promise to do it.. Let's see how it goes.