If you have the ability to win on a regular basis with a Bookie , they can & will minimise their exposure to risk by minimising their payout figure to you,on any given bet, therefore minimising your action.

The TAB makes 16.5% profit regardless of the result , the more that`s put on a particular hores, the lower the div will be , because its based on the weight of money outlayed & all divs are finally calculated once the race has closed & the TAB`s 16.5% has been taken out .

So , all those divs you see on the screen ,have the TAB commission already taken out.
If you multipied the div by 1.165 ,that would be the normal price if no commission was taken out .

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Cheers.