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I assume that since you use a Chromecast you are probably an Android/Windows/Chome Browser user. Not everyone is, and some people actually want to stay away from Google. Somewhat related to that, I suspect this is going to be easier to use with devices and OSes that don’t have Chromecast support. The price might also be cheaper, but with the Chromecast at $35 I am not sure how much of a discount Mozilla could offer.
Here is a link to GigaOM’s YouTube video about the Firefox OS media stick: http://youtu.be/VS0VUOfrycw