In most circumstances I think a common thief couldn't afford the time involved. I don't recall the source but IIRC the average home burglery takes under 90 seconds or so. If there's an alarm they literally are in and out well before law enforcement can arrive unless they were right out front. If by chance the occupant was home you'd be taking a terrible risk breaking in with a sledgehammer or something...if that homeowner is armed you sure aren't gonna have the element of surprise! You'd probably be greeted by several loads of 00 buck.