What I have found is the profit starts to kick in with fields of 9-15 runners .
Anything less & one will find that the selection SR may be the same but the value just aint there to show a profit.

If one wanted to test this , target all races with exactly 8 runners .
One will be supprised to see that no matter what one tries to do to filter the edge , the race will be won by really short payers or really long payers, frustrating stuff.
One will also notice is that the real inform horses will often not perform up to expectations.
There could be a number of reasons for this
e.g. the race could possible have an uneven pace to it ,which allows anything to swamp the field from the rear.

One may devise a system for these 8 starter races , but one will see that it changes dramaticly month to month & thats not really what one needs if one is trying to target some consistancy into their punting strategy.

Cheers.

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Cheers.