for the same reason that there are no public plays in baseball, its also dangerous to pay too much attention to line moves in a purely moneyline sport.
all the value in the world isnt going to help you if your team cant win the game straight up.
.... and thats what it all comes down to.
in football or basketball, you at least have numbers and spread value working in your favor.
but baseball is cut and dry.
you either win or lose. line moves have no impact on the game. the bets are graded all the same.