Okay. I didn't understand your point as originally expressed.
But a company can't just put a high profit on extras an expect them to sell. The product has to be worth its asking price to the consumer. Extras can command a higher profit margin, but they still need to justify the expense. The problem with external Kinect is it doesn't have much obvious use at this point, and presumably the voice control isn't a big deal to those buying the Kinectless SKU (otherwise they'd have likely bought the other one, although they may have paid less now to buy the peripheral later). Given no clear support from MS regards upcoming titles, it strikes me as a very difficult sell at $150. $150 gets you a peripheral and a small dance game. Wii Fit was pretty costly at $90 and that came with the full fitness game. I could understand $150 including 1 year's Xbox Fitness maybe, which might still be part of the deal, but even then it's expensive. The original Kinect sold so high because of the novelty and promise of things to come. Kinect 2 neither has the novelty, not the future promise looking at what's been announced.