When you run a business (especially on a small scale), there may not be a whole lot of barriers to entry. And while this may have been great when you were first starting out, as you grow it can impose a difficult challenge onto your business. As a lot of small business owners would happily (or perhaps morosely) tell you, it can often be very difficult to find good help amongst the pool of drug addicts, flakes, crazies and lazies who tend to inhabit the unemployment line. And while those people are easy enough to weed out (because they often just do not show up, and then wonder why you fire them), the worst kinds of employees are the ones who stay around long enough to get good at their jobs- and then go off, start their own businesses in the same industry, and become your competition.
There are few things that are more frustrating than essentially training your competition. To see someone at a conference, knowing that you taught them most of what they know, and that they are now using that knowledge to take away customers that used to be yours, is enough to inspire a few evil thoughts in most small business owners. After all, a few good customers can make you, but without enough of them you will inevitably end up broke.
But there is a solution to this problem. But it can be a little bit tricky. What you have got to do is keep your skill sets highly separated. If you have people who go out into the field, make sure that the entire job can never be done by just one person (or a duo). By having a sales force, a scheduling force and an installation force (depending on your business type, of course), you can keep the skill sets of your employees different enough from one another that no one among them can start their own business.