If a forum is using vbulletin, then quite honestly, managing it would be a nightmare. I have used most of them, and whilst free is good with the others, a little money buys you a wealth of spare time from editing rubbish constantly. Using image verification and other features, bots can't register and post automatically here... they must manually do it, hence why the majority who do manually register to spam here, first miss the bold moderation note during registration, secondly once registered, they usually find they are in moderation and go elsewhere immediately. Very few spammers actually make a post for this reason, and only editors see it anyway, so its not loss to us. Takes them longer to register manually and make the post than for us to remove all posts and ban them.