It shouldn't be allowed. You could suggest it, but not make it mandatory I believe. This wasn't properly enforced, among other things.

I don't think he acted on his own.

Nobody cares about your skewed point of view.

This forum has become a slavery market place, for the love of God ban all the low paying signature campaigns, I don't know if theymos ever thought about doing this or not? if there are no low payment campaigns then no body would create 10+ accounts in order to earn a good amount by posting nonsense over the forum.
Just ban them and see if the spam problem is fixed or not, for starters please ban any campaign paying less than 0.0007 per post, you'll see what happens, I know traffic is good but if these spams continues then visitors will no longer come here because they couldn't find something other than spammy posts.

In long term traffic will decrease, if you only allow the high quality camps then admins/managers would keep their participants only if they were good posters.
IMO all the low rate payment signature campaigns are the main reason for so much spam.