"We value your privacy. Literally. Scarcity makes your data fetch a better price."

Or once could say, "Rest assured, as we gradually erode the sanctity of your privacy, the time will come when all interested parties will have sufficiently profiled you. Eventually, you will be distilled into a simple element within a behavioural prediction model. At that point, we will be anticipating your actions even before you are aware of them. Then you won't have to worry about being watched."

Perfect behavioral prediction wouldn't be enough. They want nothing less than perfect behavioral control (modulo a few 'free choices' they allow).

Lest we forget, this is (of course) the ultimate goal of all advertising.