landmines are cheaper.the DMZ has plenty of those too.
Yea but these things are cooler. Now, an entrepreneur could certainly hook these suckers up online, and provide pay-per-shoot services. For $39.99, you can stake out a 1.5 mile chunk of the border with your joystick for a 8 hr shift. If you dose off it fires auto (so libs couldn't pay to shut a station off at a particular time).
1400 systems * ~$120/day = 168K/day = 61.3M a year. Say half a that to maintain the system, provide advertising, etc. The system pays for itself.
Darn that's a pretty reasonable business plan...