Why not approach the board of the NDA with the issue that the NDA is not really serving the companies in the 2-10 million a year range? Perhaps the NDA board would be willing to create a new division to handle the needs of that market, with an advisory board and a designated seat or two on the existing NDA board.

That way the guys in the middle range would be guaranteed a say and a vote as against the big guys "in the club." It seems that it might be more effective to try, at least to try at first, to work within the NDA, rather than to try to compete against them with a new upstart trade association. And I think the NDA would probably prefer to have it that way too, rather than to spawn a splinter spin off group. Just my 2 cents.