You might as well turn off the lights and throw darts to determine how to make a profit. This book publishing nonsense is the most irrational and inefficient system still waiting to be laughed off of Wall Street today. The only industry in bigger denial of it's outmoded institutional dogmas is religion. But they still have a viable product: FEAR.
Speaking of religion, it's often said that Christianity succeeded when it did because it welcomed women and slaves. Sounds a lot like the POD movement which is eating the flesh off the bones of Bertelsmann et al.