[puranjay]

The thing about business/education/training books is that they don't have to be priced like conventional non-fiction books. You sell them on the value they provide.

If you give me a system that will help me become a full-time programmer in 12 months, making $75/hour, then I'll gladly give you hundreds of dollars for the book.

Out of 100, at least 3 people will see that value. If you charge $50/month for the book/course, and have a list of 3,000 people, you are effectively looking at a full-time income