I’m guessing MT’s idea is a lot less expensive than lojack. Their vehicle recovery system goes for like $700, and I bet if a company mass-produced something like MT’s idea it would be like $60, and wouldn’t require a technician to install it.
I still think it’s a good idea - I think there’s a niche for less-hardcore theft recovery stuff. You could just buy it at Radioshack and slap it on/in whatever you want.