It may depend on what you are doing. Maybe staking to win a set amount or laying to liability may be a better option as, in the case of backing, you are then putting more on the lower priced horses which, theoretically, should win more often than the higher priced ones.

Having said that you will still be winning or losing x% of races.

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Never give up on a dream just because of the time it will take to accomplish it. The time will pass anyway.”

― Earl Nightingale