I registered on their forums a while back, but I didn't pay for a membership until I had a chance to sit and talk with some of the members face to face. I will keep my oath whether I give them money or not, so I asked those guys why they joined up. It's not really a lobbyist group, so the dues go to help the marketing campaign, keep the forums running, organize events, and fund efforts to get current military and LE onboard with the mindset that they will not follow unconstitutional or otherwise illegal orders (something we've been talking about here on COAR15 recently). I think that's a worthwhile effort, so that's why I paid for a membership.