So in conclusion, while on the surface it may seem that your staff is replaceable. The truth is that it takes both time and money to replace the knowledge and experience of a tenured staff member. It also slows down future growth plans and sustained growth in other team members because they get saddled with picking up the workload for a missing or new hire trainee, which reduces productivity gains from their job responsibilities and continuity within the practice.
Profitability and sustainability of your practice is a team effort, and you are the Team Leader, so be flexible, be their coach, cheer them on when they treat both their internal and external customers well.
Please read this compelling article: http://businesspaths.net/Articles/12/people-quit-their-boss-not-their-job
As a group, you spend more than forty hours per week together. Make it time well spent for one another. Make your practice elite and successful by being the place that most people want to work. It will show in your bottom line and peace of mind.