we are 4 point dogs in Pittsburgh

when i first saw that we were four point underdogs to the stealers, my initial reaction was "how can this be?! what do we have to do to get some respect?!" but then i started to think about it and it dawned on me...maybe the bookies have caught on to us, and are hoping that the betters out there have not; hence, they are trying to get people to bet on pittsburgh...now that is the only reason i could think we were underdogs...i know the game is one the road and the steelers are "desprate for a win" or whatever, but i just dont see how they gave this spread...what do you guys think?