Ask any retailer, and they will tell you: its hard to find good sales people. Its even harder to keep them motivated and happy. You see, its not only about the money. If you give your salespeople a raise, sure they will feel appreciated, and less likely to leave your company, but how will it work out on the long run?
One of my clients approached me to put together a system, that is similar to loyality systems, designed specifically for employees of a company. I attended a gamification course at the University of Pennsylvania, where we learned how to build gamification based reward systems for employees.