"Interestingly, as I was reading the Ashlee Vance book, I actually had to flip back to yours in order to fill in gaps that Vance had left behind. I also enjoyed the extra stories that you placed in the book - the Winston Churchill story comes to mind."
But it didn't sell that well because marketing is difficult even though it got good grades 4/5 at Goodreads and a lot of upvotes when I posted the first version here (https://news.ycombinator.com/item?id=6256959).
So I thought why not give it away for free because I think what Elon is doing is important and selling a few copies a month is not making me happier anyway.