No wonder you see BURSTS of posting by people with ad campaigns. I think if the "increase my posts just to increase my ad campaign post count" messages were removed the board would have 75% less messages. Some of them are just soooooo obvious and add nothing to threads. Too bad there isn't a way to weed them out and have them not count.
There actually is a few ways. One the signature campaign leader should from time to time check post quality. Most do this. It stops a lot of the "+1's" and one liners.
The ones that add a sentence that might be helpfully but chances are spam report it. There is a little button that say's report. If the person is doing this there is a good chance not only will post be deleted but have a chance of getting temp ban even.