I know theymos is trying to avoid this, but he seems to be open to the idea of potentially disallowing signature campaigns, and lets be honest it would improve the forums signal to noise ratio by a whole lot, although we would be removing a rather interesting eco system which has developed because of it. Unfortunately, whenever you have something good, it is always abused by the masses until it eventually ends up being tossed out.
We have to agree that the majority of traffic comes here for signature campaigns and other money earning services. The moment signature campaigns are stopped, the traffic will look for alternatives and this will give rise to another forum where signature campaigns will be accepted. Due to the lack of traffic, services will gradually move to an alternative as well. Yes, we would not have spams but it will affect the forum's ad revenue as well.