Well my insurance premiums were lowered significantly when I had an alarm installed, and the risk of being burgled is reduced. I know people who have been burgled and money is not the primary issue. Having someone break in your house can be quite traumatic, and some items are irreplaceable.
I have alarms and monitoring system by ADT. For those who say no one listens to alarms, when our alarm goes off the police come. ADT have been a very professional update & do regular 6 month outfit. I would recommend them if you're considering such a service