Re: The question is...
I think the idea is that this replaces your A-lock rather than your mortis. An A-lock is not really secure, since it's not inside the door and can be jimmied. It's supposed to be a daytime lock - you use it for just-enough security while you're in the home and awake, and are supposed to lock a proper mortis when you want the building to be actually secured.
Of course, why I'd want to spend upwards of $200 for the sake of replacing a $10 lock I can only use when I'm at home is beyond me.