Sales per book The end result, I predict, is that sales per book published are going to decrease as much as 20% next year… …and the short head of the bestseller list is going to be a good place to be for a while to come. But the midlist (which means most books) is going to see sales per book go down… …Bad for people who publish them the traditional way. via “Sales per book”. Written on October 27, 2011