Originally posted by rsktkr
It also depends on where the line is. It takes a lot more to move a line from -3 to -2 1/2 than it does to move a line from -5 to -4 1/2. In fact, it may not take any money at all to move the latter. A book may just wish to balance out their money more evenly so they move the line to take more bets on one side.