So some how, i discovered that there are some forum members who are periodically deleting tens of hundreds of their previous posts/comments, supposedly for no other reason other than to keep their post count low, probably to match the number of merits they have earned, or keep their post count at a little bit higher average, what ever their main motive for doing this is, I don't know specifically, but my guess is that, they may think or consider it that other forum users, or maybe campaign managers, may consider them spammers if they have a lot of posts, maybe in the tens of thousands and not many merits earned to back that number of posts up, this is true ?
Campaign managers will look at these following twos
Total merits
Received merits in the last 120 days (4 months)
Your total merits can give an early impression but campaign managers will look deeper to see your received merits in last 120 days. It is to see your post quality is maintaining at high quality or drop last for months. Deleting your old posts can not help you to pass through the manager checking.