I agree, its kinda dumb. I already have it in my car, guess Ill just buy the home kit and be done with it.
You don't get nearly the audio quality using a Sirius receiver.For $13 per month plus the cost of hardware, you could connect Sirius directly to your Onkyo and not have to have your TV sucking power to see what you were tuned to. (And get the talk channels and whatnot that Dish doesn't carry.)
I've never heard a Sirius receiver, but I never thought the quality on Dish was anything extraordinary.