[WheelsAtLarge]

That's the rule for writing books. I don't know about now, but it used to be that "Learn to" computer books were 1000+ pages. A group of programmers would get together and write mostly useless chapters each and put them all into one book. The book became a best seller simply because buyers thought they were getting a bargain.

It's the same for business books. A 30-page book won't sell, but a 250 one is a best seller.