When one purchases a franchise it is because they want to be business owners and taught by professional business owners (franchisor) who have proven business models that they follow step-by-step.
Franchisors interview potential franchisee's period. They know whether that person has experience or not and/or can follow their business model. The purpose again is to "learn how-to".
Alot goes on behind closed doors after you're into a franchise. Often too late to get out because of the capital invested. That is when you find out whether there is a proven business model in place in all areas, especially for marketing, and whether the projected gross revenue is based on actuals or some other calculations. You also find out if you raise too many questions you are treated like nothing by the franchisor for raising those questions and that you are always to blame for your business not working.
So to those who again blame the franchisee for their business failure - not every case is based on the franchisee's failure. Once you become disappointed in your franchisor it is very hard to continue the relationship in a productive manner on either side. If franchisee's were well versed on starting and operating their own businesses they wouldn't need a franchisor, especially one that is not well known like McDonalds, Burger King, Kentucky Fried Chicken, etc.