Business Case Factory

Have you ever noticed that 90% of the cases we study at London Business School are written by Harvard Business School. These cases study are purchased by all business schools across the world who pay a fee per copy. Obviously this is a huge revenue generating business for Harvard. What has enabled Harvard to gain this competitive advantage over other business schools.

My sister is presently considering a business idea!
Establish a case writing company. Develop cases that reflect the current business environment and provide students better tools to succeed in these turbulent times. Write cases on the developing markets of Russia, China, India and Africa where business opportunities are different, and so are the challenges.

Is there a viable business idea here or is this just one of her fancies??
What does she need to kick off the ground?? What will enable her to build a venture that gives competition to Harvard??