I hope this makes it to the ChromeCast vampire thread.
I came upon that thread by searching for "chromecast vampire bandwidth" and I was searching on that because I had discovered that unused CCs were sucking quite a bit of my bandwidth, about 1/2 gb/day. That is significant to me because my average allottment from my provider is only about 2 gb/day. That determination made by looking at my Tomato router.
So, maybe y'all are missing the point? The 2 watts of power is not significant but the bandwidth it uses is. At least, to me.