Sad to say - I haven't joined because I have an aversion to being a paid-up member of any bike club. My reasons for this are well-known and have been mentioned here before. Basically, by not being a paid-up member I am above the political nonsense that goes on (and there's been a lot of it here lately), I don't have an axe to grind and I don't have a right to express an opinion re. certain issues.
That suits me very well. I get on with the business of having fun with bikes instead.
Some people might think this is being unduly tight but, I believe I'm a net contributor as I do my best to help out with technical stuff, knowledge I have found re. my racing 800ss experience etc.