Ah but it isn't really free money. By installing two if these things, you've essentially hooked yourself to your insurance provider for six years. I'd happily give away two $300 bags of crap to get a customer handcuffed to me for six years.

Disclaimer: I hate car alarms with a vengeance. I think if a car alarm sounds and does not shut down within ten minutes (automatically or owner's intervention), there should be a large fine (I'd say the value of the car).