This thread is getting huge...and almost everyone has said that, in spite of their reservations, they're going to send their $30. Me too.
For me I don't really want to pay $30 for a special members-only area. I like the PBS model. Everyone should see the same stuff. In fact, why not just sell memberships like PBS. Contribute your $30 and you get a little "Charter Member" icon beside your name. You could even have different levels of membership (and different icons) for those who want to contribute more.
This approach allows you to support the sport and also let others know that you're a monetary supporter. You feel good and maybe it will generate a little peer pressure on the "free loaders" to contribute. Come on...all of us who particpate in this sport have invested a couple a couple of hundred dollars in equipment, to say nothing of gas every time we search for a cache.
Jeremy, you get my $30 either way. Don't feel obligated to give me special members-only features others don't get. If you want to recognize my contribution by putting an icon beside my name....great.