Giblet, I preview to have something like an email to the mods when someone reports a post as spam. A mod then needs to check the post out and close the report (which would make the post visible again) or delete the post (which would close the report as well).
Obviously, as is in the forum regulations, if there are "report spammers, they will get a warning or a ban.
Also note that this system will work for topics too, but then you should just report the post as spam and NOT reply to it, because otherwise the replies will still be visible.