I am only selling at Barnes & Noble
I won't be putting any more books on the Apple store because, in four years of selling there, I have made less than five dollars.
I am not using Amazon either as the story is much the same as Apple; this year was a bonus as I earned six dollars, only because I sold three copies of "A Homecoming," other than those sales I haven't sold at Amazon for years.
As I expected the book on sale at Smashwords sold but I never saw the income, I always had my doubts about the site as other writers have told me the same thing happened to them.
So, the only site to get my books from is Draft2Digital/ Barnes & Noble.