Ian,
(Speaking entirely from a personal perpsective) I know there are many people with those same sentiments. I too was a member of both clubs, and attended a number of GTD Club events/attended events.
However even when a member I always thought things would have been better with a single club, uniting all. There has been a higher focus on track days etc. within the GT40 Enthusiasts Club in recent times, so maybe this now caters for the requirements for all?
Max
(These are my personal opinions only, not comments from the Club/Committee)