Yeah, I think you're right, there must be a network where a human spammer is assigned to answer the Q&A, and then can set up bots to go from there. I need to add about 200 Q&A, that may help.
I will copy the message I have at vb.com, I am working on a spam tool with Eric, to help admins and moderators detect spam in new members who actually get past the registration but have not made a spam post that members will see and report. Generally, there are a lot of spammers who never post, but have spam in their sigs, or homepages. Eric based it off his new members mod, and I'm sure half of the people here can tweak that to achieve the same results as my Spam Check mod. I would rather reward him for helping me, and when it is finished, let him release it as a new mod (my contribution to the Global War on Spam

).
It's just a variation of the New Members mod, but it lists the user signature (if they have one) and homepage (if they have one) on the member roster, making it super easy to detect spammers with spam sigs or homepages. There is also an option for
moderators to "Infract" them into a spammer usergroup, allowing you to Move/Prune them off the db.
I have asked him to add the custom user profile to it, that should be all it takes to easily detect and prune spammers at will.