There's so few shows aired on over the air broadcast channels that I actually want to watch that it's easier for me to just torrent the handful of things I want. As a bonus, since I'm on the west coast, the fact that the torrent uploaders all use the east coast airing works out in my favor because of the time zone difference. I can generally be watching an 8 PM show by about 6:15 PM (as in, within about 15 minutes of the airing ending on the east coast).