The most favoured column in the Sat Australian has a strike rate of
28% 1st sel
17% 2nd sel
10% 3rd sel
Total 55% in top 3
or 45% in top 2

This is based on 2 years of results ,it had exactly the same percentage for each year.

So you could treat it as a 2 horse race,with the top 2, select the one you feel has the best chance of winning & only bet on it if you can get $3.30+ at jump time.

The reason for the $3.30 rule is if you back horses below that figure you will usually end up breaking even.
It`s the old ,one must try & obtain value .

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Cheers.