I've just finished doing quite a bit of reading and research on this since e-books are big responsibility of mine as a librarian. The data seems to point to mos

I've just finished doing quite a bit of reading and research on this since e-books are big responsibility of mine as a librarian. The data seems to point to most people not having a really strong preference. There are a small percentage of people (less that 10%) that prefer ebooks and a larger percentage (30%+) that prefer physical books, but most people's preference is either complicated (they prefer one for a specific use case such as travel or technical books) or not that strong. We are looking to shift to a fulfillment model, which reduces collection crossover some. Most people just want to read their book and will take it however they can get it soonest. For what it's worth, I expect our ebook circulation to top out at about 30-35%, which is about where estimates of the commercial market are. Those estimates are complicated by Amazon's holding Kindle Direct numbers close the chest, which are probably fairly large.