Contests are a good incentive to reach higher, but remember when you run a contest that you should keep it reasonable and don't give away more than you can afford to. Also, be aware that there are some who won't move no matter what you do. They're tire kickers and there are always going to be these types no matter what business you're in. Work with the workers and don't let the ones who won't work worry you. They either get it, or they don't. It's that simple.