To add a personal view....
I would of used the color chart as a business card so to speak. Put the club info on it of course, let people use it, talk about it, get people interested in the breed. Many people would be curious, go check out the club, ask questions and a good chance they would join the club.
Win, Win all around.
But what the other club is doing, is driving people away, with their very aggressive behavior.
I love the Marans chickens too, but the extremely aggressive and nasty attitude most of the members were displaying, totally turned me off from the breed.