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The Refs Association does encourage such things from clubs. Maybe a current player considering retirement sees coming to The Dark Side as some sort of stigma and resists the temptation?
Seems there's a lot of players (and spectators) who offer the referee a fair but of encouragement and advice about how their game is going, yet they seem unwilling to let all teams have the benefit of their wisdom - and showing the curent refs how it should be done properly - by getting their ref qualifications.
Come you guys - it's easy!