job is to set a line to capture 50% of bets on both sides so they make money on the vig (10%). Vegas predicts what the line should be to capture 50% action on both sides which is predicting public perception, not necessarily one persons. However, because so many non-emotional people are betting with their hardhttp://www.cougarboard.com/board/message.html?id=14494073#post_form earned money, the public generally seems to be in the ball park of predicted outcomes.