Originally Posted by redsrule2500
Vegas only measures public opinion of betters, they don't actually measure the sports/players. The goal of any Vegas Casino is to have their odds directly in the middle of all the people placing bets (50% bet above, 50% bet below).
This way they can take 100% of the "cost to play"
Edit: I now see this was addressed above by AtomicDumpling as well.
It is all "baked in the cake". Pro gamblers would be all over it if Vegas didn't set the lines a touch low. Either that or Vegas can adjust the "juice" so that you win more for an over bet than an under bet.
Point being, the threat of injuries is compensated for.
If Vegas tries to set the line "falsey" so that Joe Schmo public bets 50/50 on it pro gamblers will pounce all over it and Vegas knows it. It's a fine line to walk.