Why would you buy a console instead of a handheld or tablet if you didn't want to use a TV?
Why do I use my iPad at home instead of my Mac mini plugged on my plasma? Because it's more convenient. Why the GamePad at home instead of my 3DS XL? Console games in my hands baby.
No off TV, no sale. I don't even have half enough time to progress in the games I have. If I need to wait for the wife to sleep to play, it will just add to my backlog.