I don't believe the $200 number. We just got a new Volvo with BLIS (Blind Spot Information System) in which a light on the driver's side (or passenger's side) mirror comes on when a car in the adjacent lane approaches the driver's blind spot. The cost - $700, and there is no camera/monitor - just a light.
Also, I'm sure the cost of repair should the camera/monitor fail will be very expensive. Furthermore, in states where there is an annual inspection, I would expect this would be an item that would have to pass the inspection.
I'd rather be governed by the first one hundred names in the telephone book than the Harvard faculty - William F. Buckley