I'd imagine houses get broken into for far less stuff than they have, but I wouldn't wish it on anyone. Not trying to be a downer, but I won't be doing a mock up even as a joke, as I'd feel awful if something did happen.
Their lack of security consciousness makes them more vulnerable than most, e.g. flaunting what goods they have, giving away layout details of the house, showing security weaknesses, knowing one adult sometimes does night shifts, having an idea of when they're away etc.