I don't see much reason to install a camera system. Thieves would just smile and wave at the camera as they are making away with your stuff. You wouldn't know who they were and police probably wouldn't know who they were, so why bother.

The only way I can see that a camera system would be useful would be if it could alert you to a break-in via your smart phone and allow you to actually view someone in your home so you know it's not a false alarm.