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The problem is, those figures aren't granular enough to use for marketing purposes. For example, it's known that about 50% of genre SF/F book sales go to about 20% of customers -- and about 45% go to less than 10% of customers! Some folks are reading over 100 books/year. (I know plenty of them.) We know there's a curve; we just don't really know it's shape in enough detail to predict how an all-you-can-eat book buffet will pay for itself.



> We know there's a curve; we just don't really know it's shape in enough detail to predict how an all-you-can-eat book buffet will pay for itself.

The thing is, Amazon might. They can read the distribution of books bought per unique user annually straight out their database, and them being the size they are, that seems like quite a good proxy for how many books are read per year by people.




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