J.K. Rowling has STILL refuses to allow the Harry Potter books to be released as e-books (until her own little Potterweb, or whatever the heck she's calling it, is ready) but that sure hasn't prevented her from being one of the most-downloaded authors online. She just doesn't get a penny from it, because she has chosen to go that way.
As compared to Louis C.K. who has taken in half a million dollars in four days by having a DRM-free download of his Beacon Theater performance available for $5.
https://buy.louisck.net/
Or, of course, Cory Doctorow, who manages to do quite well on book sales even with having his books available as free CC-licensed downloads.
http://craphound.com/