If you live in a house built before
1950, you'll find that there's often no place for a TV in your house.
For example, in my tiny starter home, we have a single living room. This room is designed to be focused around the fireplace which takes up a large chunk of the room. Putting a TV on another wall really disrupts the whole feng shui of the place.
Possible solutions to this are to put the TV in the fireplace, thus rendering the fireplace useless for it's intended purpose (or the TV for its intended purpose), or to get one of those cool flat screen plasma TV sets and put it over the fireplace on the mantel. If we could afford the latter, though, we'd just get a bigger house.