I think it's a reasonable idea.
I think this is a reasonable idea. I seriously doubt anyone who nicks a device goes in and spoofs the MAC address. My mom pointed out one issue, who writes down the MAC address of their device? That said, I wouldn't want the police routinely logging MAC address versus location (since it could be used to track people's movements), but it sounds like this is just fed in a "hot list" of MACs and would alert when it saw one. That certainly beats the "nothing at all" that can typically be done to find stolen hardware.