I disagree and the zillions of posts just here on DBSTALK from people complaining about this same issue seem to support my opinion. Why pay $6 a pop for more "boxes" when many households have many rooms (and TV's) but not that many TV watchers?
I have many friends with DirecTV and other TV providers and each and every one of them watches the output from a receiver/cable box on multiple TV's using RF remotes or IR senders to transmit the remote control signal back to the "box".
In fact, I watch the output from one of my R15's on THREE different TV sets!
And the question is why? Why spend hundreds or even thousands of dollars on additional TVs, IR extenders, and cabling when you can only watch the one program at a time? Can't people watch the same program in the same room anymore? Think of all the electricity that could be saved if these people would just pare down their TV collection...