Why not use two seperate panels when designing a high end system?

["SecurityNovice" <nospam@xxxxxxx>]

Here is something that to me seems so obvious, but something that I have
never seen or employed personnaly.  Lets say for example I am designing a
system for a high end jewelry store.  I call for my glass breaks, my
motions, a Potter vibration on the safe, high security contacts on the
doors, and maybe a mat..  then I go home and the customer feels safe.

But for just another 175, the customer could buy a seperate panel just for
the interior safe contact and the vibration detector.  This way, if the
intruder found his way into the store and bypassed the perimeter alarm, he
would think he is home free.. But when he gets to the mother load, he is met
by another independent syste.  Of course, the panel would be installed away
from the primary panel and a radio or cell could be used to transmit the
signal.. My question is.. it's so obvious that it would be money well spent,
why does no one do it???  Am I not seeing the big picture?