For me it was because I found out how easy it was for someone to come up to my house and screw with me. About 8 years ago I started having problems with air pressure in the front drivers side tire on my truck. It was low, about 10 pounds so I got out my air compressor and reinflated it. Well the next week it was low again, after 3 weeks I finally took it to a garage to get it fixed. They couldn't find any problems with the tire, since I was there I had them rotate the tires. A week later the front drivers side tire was low again! Being this was a different tire I knew that someone was F***ing with me, so I put a trail camera in a tree and caught a neighborhood kid deflating the tire. Now I have a BI system and 17 cameras.