We're one of the biggest and busiest forums out there...if we modded every new person for their first five posts, things would slow WAY down. We would lose members...we've actually got a LOT of precautions in place, the spammers are just getting more creative with getting around them. It's less bots and more people who are getting paid to put this crap out there.
We could add more mods to deal with things, but you guys bitch enough about the ones we've got already.