Reenstar,
Another little known point about top flucs is that a fluctuation is the average price of the 2nd 3rd best prices in the ring. If bookie "A" has 9/4, "B" and "C" have 2/1 and the rest have 15/8, 2/1 is the fluc.
The smart bookies can lay their 2/1 money off at 9/4 and win by betting with your money.