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I personally like the Something Awful model. This is like what pinboard did before it cost yearly. I would certainly pay to use something like this, since it would pretty much stop a lot of Spam, Harassment, LQP, and Trash at the door. However, I would suggest that rather than letting users use the site for thirty days, perhaps allowing anyone to read it, but requiring money to sign up for an account and post/comment. If this were implemented, I would gladly pay for my current account.