TorrentFreak mentions an incredibly relevant speech by Paulo Coelho (author of best-selling The Alchemist).

Coelho understood the potential of getting his books to more people and took the brilliant step of pirating his own books.

It makes perfect sense if you consider that one of the biggest obstacles facing artists of all kinds is actually getting the attention of potential fans. If people never hear your music or read your books then you never have a chance to be noticed or appreciated. You have to reach them first.