Bowker found that most authors looking into self-publishing are going to bring fiction to the market. That makes sense because only 25% of the titles produced by traditional publishers are fiction. When so small a door is open to authors, they have to turn to other avenues if they want to reach readers.
Oddly, though, readers polled by various organizations say they prefer reading fiction at a rate of 77% to 78%, leaving a very small number that prefer reading nonfiction.
It seems that indie publishers are giving readers what they want.