There is nothing wrong with an organization providing goods, services, etc. exclusively to its members. This is common and usual practice and explains why folks pay dues to become members. On the other hand, if the goal of the organization is to grow its membership, it needs to advertise its benefits to non-members. I don't think the AMA does much of a job at this, and I would like to see the AMA spending more thought, money, etc. on promoting model aviation to non-members; to the public at large.