re: LSU a 16 point favorite.

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Nope, when you make a wager your point spread is locked in at what you bet. What the line does after your wager does not affect you.

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That's what I would hope and assume. If so, how does moving the line help the bookies?

LSU opens at -9, most of the money goes on LSU.

Line moves to 16, then most of the money goes on MSU.

Now, there's equal money on both teams, but most of the money on LSU is at -9 and most of the money on MSU is at +16. What happens if LSU wins by 13? Most of the bets on both sides are winners and the bookies lose money. If that's the case, how does moving the line to even the money guarantee the bookies to come out ahead?