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So it comes down to:

You need a 150$ device, but the feature that seperates it from every 10$ webcam or a Playstation Eye isn't even used. It consumes a significant amount of processing power, and only to do something a DualShock3 controller could do as well (but more precise), but which isn't usually used with DualShock3 controllers because the alternative of using the right stick is considered better by most?