Our friends at Ingram told me another piece of anecdata which may also be at play. They keep track of the number of SKUs that sell 100 copies or fewer and those that sell 10,000 copies or more. The aggregate sales of the former group is growing; the aggregate sales of the latter group is not. What that suggests is that the sales of books that are not really commercial are taking share away from those that are, whether those that are come from publishers or indie authors like Hugh Howey. Whether that particular change is yet impactful, it is inexorable.
This is particularly meaningful for librarians as the bulk of our circulation activity is bestsellers and blockbusters. I have always wondered if we are locked into that model or if we could find ways to get out of the bestseller model. Based on this and other anecdotal data it would seem that is is possible for libraries to shift their circ patterns to a broader sampling.