On one of the calls he just casually mentioned that four months

 One of the first surveillance systems I installed was for a friend of mine down here in sunny Florida. He has several sucessful restaurants and he was going to start his test of the equipment on one of the units that happened to be located near the beach. 

 The installation went smoothly, and we had him up and running in short order. He was now able to watch the restaurant from home on his laptop. He was so pleased with the system that he had it installed in all his restaurants. He has called me several times to tell how much he appreciated me taking the time to convince him this was a good move. 

 On one of the calls he just casually mentioned that four months after installing the systems, he has not had a workmans compensation claim in two months, something that was very common before the cameras were installed. This alone is paying for the systems. Not only is it saving him money, it is saving him time. He isn't filling out forms, or going to hearings. The cameras have foiled the old accident game. No more paying for back injuries that never happened. The employees now know that if they fell, the camera would see it, and the result is no more phony claims.