[bromley]

If you are out (at work or on holiday), but you need a maid or repair person to have access to your house, I'm guessing with this you can:

a) grant them access without the hassle of getting another key cut and less of the awkwardness of trusting them with a key (if they're worried you'll point the finger at them if you're burgled);

b) have a record of the times they made entry (and they'll know you have it, so it'll reduce your fear of them burgling you some other time using the key you gave them);

c) revoke access without the hassle of changing the locks (and giving a new key to all the other people you've granted access to) or the fear that they may have made a copy of the key you gave them.

I don't think you need to be paranoid to realize that there are circumstances when this sort of control could be very useful.