Youngy might answer better but generally runners are handicapped conservatively first off and then after a few races the handicapper probably finds their correct mark. The officials are generally strict around people who run inconsistently. But you are right it is hard for consistent runners to win. Often the event can be won by an improving runner who has got in with a good handicap. This is the richest professional race in australia. I think first prize is about $30,000 this year.