Why the staff allowed to put a sig ad and after ban a lot of users because they are posting 30-40 posts per day? Isn't it better to ban all the signature campaigns?
aka
Not a very good train of logic.
Would it make sense to ban all users/trading since there are plentiful amounts of scammers? No, discretion is used.
Signature campaigns can coexist along with productive posting. The solution is to monitor for spam which the mods do quite well.