I've been a life member since 2001.
I get a letter from them about 5 or 6 times a year. Pretty easy to just throw it away if I don't want to see what's inside.
While it may seem a bit wasteful, it's not that bothersome to me. The return on the investment must work out to an advantage, otherwise they wouldn't do it.
I am a NRA Life & Endowment member and Rick's post is closer to my experience, then yours. Sorry you've had an aggravating experience with the NRA. I have no idea why they would send you more then 7 solicitations a month- when I, who actually have given them a lot of money- would get a fraction of that. It certainly is inefficient. There is a means of 'opting out' of solicitations but I've never been inspired to take it.
As to your other issues, unfortunately what makes the NRA (or any other lobbyist) effective is membership size & money. That is why the NRA is THE gun lobby, while other great organizations like SAF, CCKRKBA, GOA, JFPFO, etc are niche groups known only to the hardcore activists (like us). They are more ideologically pure and consistent, perhaps, then the NRA, but completely ineffective on the national stage. No one cares what Larry Pratt has to say while Wayne LaPierre is the face of Gun Owners. Also, we expect the NRA to work for us in Congress, Federal Bureaucracies, Courts, and in all 50 states but never ask for any $$? That isn't realistic. No doubt the NRA could do many things better and I agree there are some priorities that need rearranging but the very reason you love the SAF (they never ask you for $$) is why they are insignificant. I hope all these other groups grow and put pressure on both legislators & the NRA to improve.... anyway several others issues you've raised, but the gist is I think ,while you have a couple of valid points, the NRA isn't nearly as bad as you indicate.