Del Rey released my Star Wars: Lost Tribe of the Sith e-books for free -- more than a million downloads all told -- yet despite everyone already having the stories, a print edition was constantly requested. That book is now on its 13th printing. (With some extra content by me, as suggested above: my maps and an additional story.)
It's not always possible to make every format available, but giving readers more options generally nets out positive.
It's not always possible to make every format available, but giving readers more options generally nets out positive.