http://finance.yahoo.com/news/The-Fitness-Revolution-Will-nytimes-3089176708.html?x=0&.v=1
This goes to show that all good ideas, while being profitable, will reach superstar results with a simple marketing plan.
p90x used before/after pictures, user testimonials, and a bogus made up term called "muscle confusion" to make the sales. This just goes to show how important delivering the want of a product can be.