Yah, the increase in size sort of feels like an increase in quality even though it may not be when it comes to contrast. One thing I will say though is that projectors do often have some traits better than some TV's. It just depends on what TV vs. what projectors.
Many Projectors actually cost less for the quality you get when you get up into the 70"+ screens
Some TV's appear too digital with pixel spacing, so you cannot sit as close, whereas some projectors have precise pixels and less screen door effect (SDE).
Projectors often have better post-calibration results with their color management (well some of them anyhow).
Projectors are more portable, easier to move if you ever need to (TV's can be a major pain to move, especially very large ones)
TV's take up a bit more important usable space in a room whereas a projector you can ceiling or shelf mount out of the way, but a TV is in the front, where a PJ screen is very thin (although some TV's are).
If a problem develops, projectors are much easier to ship back to get warranty service (TV's you usually have to wait for someone to come to your home or take it to an auth repair center)
TV's handle ambient light better, projectors are best in a dark room
TV's have a much higher contrast when comparing per dollar (although not really if comparing per dollar per screen real estate, since TV's over 70" don't tend to rate that high in contrast)
Projectors require extra cabling and usually some cabling across a distance (attic or under rugs or wall cabling)
Projectors with decent black levels tend to be expensive (JVC or Sony or Epson)
Projectors like dark walls and generally dark furniture in overall dark rooms (although it's not 100% necessary)
Edited by coderguy - 7/8/12 at 2:54am