I have been on the fence. Our area doesn't seem very active. I get enough MB socializing from this site. Heck we should start a club, at least the diesel guys in my area do 2-3 nice meets a year. Always a blast.
Membership dues are free to!
Their newsletter is OK, kind of a lightweight pat on the back mag. Not very interesting. Mercedes Enthusiast is a better read when you can get it.
I don't need the discount. I buy enough from the local dealer, I don't pay list...
Still one day I will probably join.