Sam Harris on why most books are overly long:
I love physical books as much as anyone. And when I really want to get a book into my brain, I now purchase both the hardcover and electronic editions. From the point of view of the publishing industry, I am the perfect customer. This also makes me a very important canary in the coal mine—and I’m here to report that I’ve begun to feel woozy. For instance, I’ve started to think that most books are too long, and I now hesitate before buying the next big one. When shopping for books, I’ve suddenly become acutely sensitive to the opportunity costs of reading any one of them. If your book is 600 pages long, you are demanding more of my time than I feel free to give. And if I could accomplish the same change in my view of the world by reading a 60-page version of your argument, why didn’t you just publish a book this length instead?
The honest answer to this last question should disappoint everyone: Publishers can’t charge enough money for 60-page books to survive; thus, writers can’t make a living by writing them. But readers are beginning to feel that this shouldn’t be their problem.