Do you live in a very high crime area? I've never had anyone ever break into my home in over 40 years of owning homes, and statistics show that most people have not ever been broken into. In my earlier years the first house I owned was not in a award winning neighborhood either! I just don't get paranoid about it. As long as you keep stuff locked up you should be fine. Burglars today aren't stupid, they know people have cameras, so they just wear a mask over their faces, so you spend all that money just to see a masked man. It would be cheaper to have motion sensors installed, but I don't do those either. The only alarm system I have are my two dogs, and one is quite large, something a burglar doesn't want to run into in the middle of the day or night.

At the end of the day you have to do what will make you sleep at night.