Great idea. Another one I'd like to throw out there is moderated first posts. I know there's a plugin for other forum software, so I'm sure there's one for
vB.
Basically a user is able to post on signup, but those posts are only visible after a moderator has gave them the all clear. It wont stop the spam, but it'll stop users from seeing it.
My forum pales in comparison to WTF, but I still get a lot of spam bots trying to signup; not one has been successful. I'm not sure what systems you use, but stopforumspam has proven itself to be excellent at stopping spammers for me. Combine that with a captcha and some signup questions and I'm spam free.
Persistent spammers will always get through I fear, but at least this will deter the less determined ones.
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