Well, yeah!
Of course I agree with you. But as I posted above, the NEA is looking for ways to regulate home-schooling. A financially strong NEA has a better chance of getting at least some regulatory legislation passed.
The NEA is illegally using a portion of it's members' dues for political activism. We, home-schoolers included, need to convince teachers who belong to the union to request a refund in order to financially weaken the NEA.