Homeowner's Insurance Discount For Surveillance Systems?

In my area, Alabama, it is my experience that insurance companies only offer their customers a discount for installing a monitored alarm system and not for video systems. I am currently installing both for a Regional VP of Marketing for a national insurance company. He actually brought up the point to me after being impressed with the advances that have been made with quality, usable video. He is going to be tossing the idea around with his company. I'm wondering if anyone already has an answer as to why discounts are not currently offered for surveillance.

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