I have been an NRA member for over 40 years, my Dad since the 1930's, at one time, including my 3 brothers, we had 5 members living in one house, and never, at no time were we ever 'bombarded' with junk mail. They have never come close to burying me in junk mail.
I get more junk mail from AARP, which I am not a member of, and AAA of NJ, and I live in Vermont, than I ever have gotten from the NRA. Hell, I get more junk fliers from Domino's Pizza, and there isn't one of them with in 75 miles of me.
You join a gun rights organization and complain because they send you gun rights information? The NRA has 2 main weapons to use, direct lobbying and grassroots activism, both require money and numbers to make them effective. How far do you think your $35 actually go? If my memory serves me correctly; ILA, the political arm of the NRA gets 0% of your dues.
So you join the NRA to feel like you are doing something to help fight for your rights, and they will do the actual fighting for you for the additional expense of having to toss a few pieces of mail, or answering the phone, or getting a DVD in the mail (and having to decide whether to just keep it, pay for it, or send it back in the addressed, prepaid mailer that it came with).
And, you know, most of the 'junk mail' they send you, takes about 30 seconds to open and read. About 1/2 the time of a Miller Beer commercial on TV. Maybe it wouldn't really hurt to read a few of them and find out what they are trying to do on your behalf. It's kind of amazing that the NRA is able to get anything done considering how many members feel overburdened by simply taking a 1oz letter all the way from the mailbox to the trash can. Then again, thinking about how many shooters can't even be bothered taking down their targets when they are done with them, maybe I shouldn't be to surprised.