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However, rather saying 'Don't pay too much' we should say something along the lines of 'amount of membership paid and donations value does not equal a large say in hackspace running' essentially all members are equal regardless of how much they pay.
I say this because if someone could afford and was using the space enough to warrant £200 a month, we would not want to discourage that surely?
Otherwise I think the rule 8 you added is right on the ball, adding in Noisebridges statement is nice as well.
Jake
Andrew