I think I said the same in some earlier posts on this thread. Ultimately if people want to get in then they will. I guess it is a case of reducing the risk. I know the setup they have in Ayala Alabang works quite well.
I have come to the conclusion that if you can find the right people to help you keep your place secure (ones you can trust) then that is half the battle too.
And as someone else said, patrolling guards, not just one on the gate.