Positive reinforcement. Theymos (or someone good in his name) runs a campaign for the board in addition to usual ads. Exceptional rates (compared to other campaigns) but very strict anti spam policy. This would create a positive example for others to follow or to work towards. This is already given in a sense by other well run and high paying campaigns. It is also not unheard of that exceptional and highly active posters can negotiate special deals.
i like this idea quite a bit; positive reinforcement for good behavior has its advantages in the long run over punishment (negative reinforcement) for bad behavior; psychology and stuff. The only problem i see with this is the demand to be included in this exclusive group. to maintain this exclusive campaign, appropriate amounts of manpower would be needed to constantly monitor the posts of those enrolled. not only that, with people that would constantly be requesting to be included in that group, manpower would need to be dedicated to screen those as well. to top it off, as we know, spammers are quick to adapt, and may do so just to have a chance of being enrolled in these exclusive campaigns. but then again, that would be fixing their spamming problems in a way. I imagine thats roughly what its like to run a good campaign, yes. Im not sure it must be an official forum run campaign. The currently well run campaigns probably serve the same purpose at least for those that see a chance to get a spot. If spammers would adept their posting to constructive Mission Fucking Accomplished[1]. Which leaves us with: how to avoid or handle campaign manager that do not care about their participants posts?
hire people that hate spam as much as he does to manage most of the campaigns on the forum and spam should decrease drastically.
however, manual quality control takes a lot of time and effort, and still wouldnt solve the problem of the spammers in the bot-based campaigns (bit-x, bitmixer, yobit).