That only happens in Brisbane Metros because of the weak ring . Every where else in the country including Queensland Provincials the APnb is the on course prices.
With only two bookies , even on some Victorian provincial tracks, how do they determine a price?
As an aside, when only two bookies are fielding on course, it is ' money for jam'.
Here is an example:
Horse 1 = $4.00 Bookie A bets $4.00 Bookie B bets $3.50
Horse 2 = $4.00 Bookie A bets $3.50 Bookie B bets $4.00
Horse 3 = $3.20 Bookie A bets $3.20 Bookie B bets $ 2.90
Horse 4 = $3.20 Bookie A bets $2.90 Bookie B bets $ 3.20
etc etc
A naive punter ( C ) looks at the boards of both bookies and sees horse 1 is better odds with Bookie A and thinks he had better grab the $4.00 on the horse because Bookie B is only offering $3.50,as it might shorten with Bookie A before he gets on. Another naive punter ( D ) looks at the boards and sees Horse 2 is better odds with Bookie B and thinks he had better grab the $4.00 on the horse as Bookie A is only offering $3.50 as it might shorten with Bookie B before he gets on.
If enough naive punters follow C & D backing alternate horses down the board with each bookie it is not to hard to see how they can lay most runners , whereas if the bookies competed against each other they might not suck punters into to taking the best of the two.
This only works when there are only two bookies operating where Bookie A will only lay some horses and Bookie B will lay another set of horses.After the race the payout by one bookie is matched up against the hold of both bookies and any profit or loss split down the middle. Because of its very nature the bookies are most likely making a combined book to a huge percentage.
For many years I saw this happen when there were interstate betting rings, where only two bookies would operate on interstate races, and 'the call' from the away meeting was manipulated in that manner, however with most bookies accepting bets from all meetings I no longer believe that rort goes on.