A little known benefit of being a member is that you can send a SASE to the American Rifleman Dope Bag with one question relating to firearms and the staff will send you an answer.
I don't think they answer questions about gun values, but if you have a question about firearms or ammunition you can't get an answer for, for the price of 2 stamps you can get an answer from real experts.
If you own guns or would like to own guns in the future, you NEED to be an NRA member, especially now.
They may start sending you requests for contributions, but if ask online they'll stop.
I think they're running a special on Life Memberships now. Become a Life member and you get your choice of magazines for the rest of your life.
Members also get to vote for the leadership of the organization.