I'm NOT a member but am sort of interested in joining. My reasons for not joining are:
-- I'm already a member of one model railway group and two heritage railways, so I'm telling myself that's enough (I have a tendency to want to join everything!).
-- although I have a good collection of Canadian/North American trains, my primary interest is in British trains (I think there is a British equivalent to the NMRA though ... and I believe there is also a Canadian equivalent called CARM?)
-- I'm also trying to keep costs/expenses down and am not sure how many NMRA-related events I would be able to attend.
Rob