From the Premium Membership Recruitment page:
We are concerned about all the members-only caches popping up here and there. Not everyone (including myself) can afford or justify the $30 expense to sign on. In heavily-populated areas where this may not be such a problem, there tend to be many more caches available to general caching, with an occasional members-only cache. However, in areas such as the one I live in, with few people, and much fewer caches available, every members-only cache just serves to make geocaching cliquish and exclusive. With the price of gas these days, if we can't afford a $30 membership, we certainly can't afford to drive to other areas for newer caches!
My wife and I are "dedicated cachers." We try to get out at least once a weekend to find caches with a borrowed GPS. It's kind of insulting that the website that we all use to locate hides defines "dedicated cachers" as those who buy into premium membership.
So, enjoy the benefits of being a premium member, by all means. Enjoy the route-caching, the instant notification, the pocket queries, and the paperless caching, and more, which are a great value for the money! For the love of Mike though, please don't look down on "public" users because they don't have a membership (for whatever reason) by creating exclusive, cliquish caches.
Let's keep this sport fun and accessible to everyone!