Our bike shop has never paid rent to the church that houses us, in our 12 years of existence. In an attempt to change that, we have just recently changed our membership scheme away from volunteer hours for membership to paid memberships. We're only charging $30/year (and they get a t-shirt). And we're getting lots of new members. But some of the guys who have been around for 3 or  4 years were previously told that they had membership for life due to their many volunteer hours.