They probably get there because of a search engine.
We mod all first posts, so that makes sure that most spam never actually gets onto the site. About three weeks ago, we started writing down the IP for the spammers and if a spammer comes again from the same IP, I do a quick check to make sure we don't have any legitimate users using the IP and if not, I IP ban them in our htaccess file. That has cut down tremendously on the amount of spam we get.
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