I don't understand why a person would want more than one TV in the same room. I can only think it sensible for VP or old headphones. But other than that, I would get too distracted. We have a total of 2 TVs in my house: 1 in the living room, and 1 in my parents' bedroom. Once we had a second in my parents' bedroom, but that was on loan so my dad could make a copy of a video tape. My family argue over shows all the time, but we find ways to compromise. (Or my parents use the "because I'm the parent" argument, which trumps anything my sister and I can say.) We are blessed enough to have a DVR so that when my mom wants to watch her crime shows, my sister's kid shows are recording.
As for TVs being cheap, I know they're cheaper than they were before, but they're still not that cheap. My family could not afford an HDTV right now. We're too busy paying for more important things like food, clothes, rent... haha Besides, our TVs work just fine.