OK
Maybe the question should be, factors that reduce loss on turn over.

Try this very high strike rate method.

.Target races with 8-11 runners only.
This minimises our run of outs.

.Target the top 4 in the live Betfair market.
These win 75% of all races.

.Now delete just 1 of the 4 horses to leave us with 3 horses , using your favorite method.

.If the horses we delete win 3 races in a row , stop betting for the day , its not going to be our day & may continue doing this all day.

.Bet 3 +1 + 1
3 units on the shorter price of the 3 selections.

.Fav must be 1.80+ otherwise , no bet race.

.The 3 selections must have a book value of 55% or less if not , no bet race.
This percentage book value, is worked out for you by BetTraderPro program.

If you delete the correct one each time, you should make a profit.

Use BetTraderPro (Free) so as to make bets under the Betfair min & to make bet placement easy & quick.
This program allows you to make .01 bets if required.

Cheers.

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Cheers.