Also, amazon sells lots of counterfeit books now, so the author of the site makes money off these books but the people that actually write the books probably don't:

- https://news.ycombinator.com/item?id=32210256

- https://news.ycombinator.com/item?id=32287936

- and just reading the reviews on the books of everyone saying they are getting counterfeit books.

The author could link to a book seller that actually sells the real book, but then I guess they wouldn't get their kickback.

(updated post to appease people that would rather get next day shipping than support the authors of the books.)