Do people really think that spamming a forum actually does anything? I mean, does anybody ever actually click a link and book a bloody NY Escort?! Gets on your nerves!
There are things in place to stop automated spamming programs but its almost impossible to stop someone that is prepared to signup in the normal way and post. Best I can do is delete the user and all their messages as soon as I see them. It took longer than normal this time as I just got back from Las Vegas and I am still catching up.