Have you considered what would happen to your business if someone (actually, when someone) you really value leaves?

When everything is going well, we tend to focus elsewhere. We lose sight of just how dependent we are on a particular person or people in the team - why? Because they are so reliable, so dependable and so fantastic, that they seamlessly integrate with our life at work and make it - well, easy! 

The trouble is that when they leave, you are left with a gaping hole in your business, with no easy way to fill it.