Most people who download the book don’t end up buying it, but they wouldn’t have bought it in any event, so I haven’t lost any sales, I’ve just won an audience. A tiny minority of downloaders treat the free e-book as a substitute for the printed book–those are the lost sales. But a much larger minority treat the e-book as an enticement to buy the printed book. They’re gained sales. As long as gained sales outnumber lost sales, I’m ahead of the game. After all, distributing nearly a million copies of my book has cost me nothing.
Forbes also has the article My Author, My Life by Hannah Clark which talks about fans’ efforts to help Robert Jordan.