[ear1grey]

Indeed, though I’ve only seen once instance so far where the spammers have bothered to leave a comment. My guess is that it’s too difficult to write a robot that can leave intelligent spam, so they’re hedging their bets and hoping not to be spotted lurking in the profile pages – if you can achieve that on several thousand instances you’ve suddenly got a whole lot of pagerank coming your way.

Perhaps another useful tool would be to list the lurkers (similar to how bozos & blocked users can be listed in the Users admin tab) where a lurker is someone who’s registered but not commented.