Hope you don't mind my changing the subject a little. From the same article:
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And Amazon Publishing is a culture-making juggernaut, even if the literati don’t much think about it. According to Peter Hildick-Smith, the CEO of the book-industry analysis firm the Codex Group, roughly 25.5 million U.S. households bought books in the past month, and fully a quarter of those households use Prime Reading, a feature of Amazon Prime that allows subscribers to borrow 10 items at a time from a catalog of 1,000 ebooks, magazines, and other media, including the tech giant’s originals.
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Readers have to choose from only 1,000 ebooks? I've never heard that before. Is that per genre?
"...25.5 million U.S. households bought books in the past month..." Wow, my sales are lower than I thought.