Earlier quoted context omitted.
I'd rather not promote a business model of bloating 10-20 pages of information into 200-300 pages to justify selling a book.
It's a rough problem, though. Let's consider that writing a book, in terms of typing, doesn't take that long. However, the perception of value is proportional to the size of the book: are you going to pay for 10-20 pages of information? Now, let's consider the cost of researching that information. In some cases, it can be the output of years of doctoral research. In others, it's "only" six months of dedicated researc…
Short books for solving a problem that readers have, long books for entertainment.
People will absolutely pay good money (thousands) for a 20 page pdf that solves a painful problem. But they’ll fidget and squirm at the prospect of $20 for 300 pages of edutainment.