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If I change the monthly cost for my fanclub does that change the cost for users who are already in the fanclub – or is their payment cost grandfathered in to the price they signed up at?

From what I remember, the price stays to what they signed up to.

Will have this confirmed with Support. Please keep watching this for updated answer.

EDIT

Support have stated that if a model changes the price of Fan Club membership the price that the previous members signed up to stays the same.

CBRules