That's a good question, they must have calculated some sort of advantage from starting at -2.5. It will be interesting to see where the money goes and if/how the line moves. When a line is set and the public starts pounding 80% of money on one side and the line doesnt move, thats when you could predict the public is most likely going to lose.
Smart people set the line. From there it's not as difficult. Vegas don't like bad opening lines or they'd have me do them.
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