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I mod/admin a few forums. One of the ways we have found to thwart spammers is to block specific IP ranges. We found that the spammers typically originate from one specific country, so we blocked all IPs that resolved to that country. We also put up a message so that if a legit user came from one of the blocked ranges, they would know who to contact to get whitelisted. Thus far, we haven't had a single spammer go through the steps to be whitelisted.

I'm not sure if the OG has been tracking IPs of spammers, but if they haven't it would be nice if they would and see if they can find a pattern in the IPs of spammers.