If there is say 100,000 in a pool and the track takes a cut of 20%. Then it leaves 80,000 to be paid out to the winning combinations. 1 winning ticket would get 80,000. 2 winning tickets 40,000 each 4 winning tickets 20,000 each and right down the line. So it doesn't matter to the track what the odds are on a horse. They don't make any more or less on a race because of the payoff. They make their money from the cut on the pools.
Also typically a bookie makes his money off the juice. They try to have like say 10,000.00 bet on team A and have 10,000.00 bet on team B and make the money off the juice.
The reason I bring this up is because I hear people say the track or a Bookie really cleaned up when a certain horse or team wins or loses.