Selling "how - to" Courses (Biz Idea)

I know of a man who buys discounted hard covered books in lots of 30 - 50 for $2.00 - $10.00 each. These books are "how-to" non-fiction type books that provide in-depth information about a variety of popular subjects.

He then does the following to create "home-study courses" that he sells for huge profits in his one-person mail-order business.

a) He reads the book and creates - chapter-by-chapter - a list of questions and he notes the page numbers of where the answers appear within the book.

b) He organizes his questions into a "True or False" self-correcting test format. (after each question he simply shows the letter "T" or "F" plus the page number of WHERE each answer can be found).

c) He removes the cover from each book. He separates the chapters using a sharp knife. He then puts a simple card stock cover that he copies down at the local copy centre over EACH individual chapter.

d) He advertises his "study-at-home, how-to courses" in various weekly newspapers and sells them for a very healthy profit.