From what I hear, the lifetime membership is half-off or $500 for the duration of the annual meetings.
First, I am not a current member, but I've been thinking about it for a while.
As has already been pointed out the NRA and the NRA-ILA, NRA-PVF, etc are all different organizations that (at least somewhat) have to keep their funding separate. Your membership dues (as near as I can tell, a tax lawyer would know better) cannot go towards any of the lobbying the NRA-PVF does. You have to make an additional, and targeted/specific, donation above and beyond membership dues for that.
You join the NRA proper. They're the education classes arm. They also provide some very reasonable benefits. There's a magazine subscription that comes with membership. There may or may not be an option that is your cup of tea - none of the magazines screamed "pick me!" to me. The real benefits, other than access provided by your membership card, is the insurance. Life insurance for LEO's on the job, hunters while hunting, and something called ArmsCare insurance for your firearms, bows, and arrows against theft, accidental loss, and damage. Though I wonder just how much coverage your arrows will have against accidental loss or damage.
The initial coverage is low compared to some firearm prices lately, but you get a discounted rate for increased coverage as well- for me, only my Browning 725 Trap would need that.