Considering ive yet to see anyone in my life use a projector to watch TV, im going to say you are party of a minority of people who think using a projecter is more cost efficient and overall better than just buying a HDTV.
Seriously wtf? Using a projecter to watch TV? The only people who are going to do that are people who are stupid or don't really give a shit. You also have to have a near dark room and a big space of all with a projection slide. Also you obviously need a place to put the projector that it faces the wall nicely without anyone blocking the path.
Also im pretty sure you would need a sound system because ive never heard of a projector that emits sounds.
The only people who should be using a projectors are people who often give presentations off computers or some rich guy trying to create a theatre in their house.
Now I could be wrong about some things, but im pretty sure im right about you being apart of the minority who thinks projectors is better.