2 karma minimum to lock out spam bots
DarkShikari: I saw an interesting method used by spambots on the Doom9 forum: they would take old threads and repost them (with a link to their ad in their signature or such).Some variant of this method might work to circumvent such a policy; find a similar thread, pick a comment from it, and post it, perhaps?  It might only work 20% of the time, but that's good enough to get some spam accounts with URLs approved.Of course this would all take effort, and might be enough to lock out a lot of would-be spammers, or at least convince them to go somewhere else.