Judges are available for election each year, when clubs pick the next show's judges. How long would a judge's reputation survive if he kept getting it wrong for whatever reason. The engagements would dry up. Judges are often accused of putting up well-known birds with a history of success. Yet how often are judges criticised if the bird which won last week, or two weeks ago, is beaten.
Some birds always win, or at least are always in contention.
They win, and if the exhibitor is honest, they realize the bird is unlikely to win again. It does not mean the judge was wrong, just that the circumstances which led to the win are unlikely to be repeated. Last year I won Lutino CCs with six different birds. I know which one I think is best. It was best Lutino at the Club Show and featured in The Budgerigar in the January issue.