Just a proposal..
To avoid so much no needed posts. Maybe it is worth to control signature campaigns?
Most of bounties require about 10-15 posts a week, not really understand why so much is needed.
If this number will be reduced to, for example, 5. It will reduce number of not needed posts at least 2 times!
In my opinion, the more posts you need in advertising campaigns, the more mess and spam you get. If you have something wise and good to pass on to other forum users, just 2-3 posts per week is enough.Looking from the advertiser who wants to see as many people as possible, the client requires a large number of posts. Here you will write something in this topic, you will write something and make spam everyone will write anything so that the week will be credited