After 38 years of BMW CCA membership and 27 years as the Tejas Chapter president, I will say that my car club experience is nothing like what you describe. It has been a great experience with wonderful people who all are BMW enthusiasts. The members have come from all walks of life and all life experiences. Nothing we have done has ever been illegal and we have had fantastic events.
I have also had a good experience being a member of ZSCCA and M Gruppe.
Sorry that your experience with car clubs has been so negative.