I just have a question. If a post is deleted, does it deduct it from the post count aswell. Otherwise this is just an easier way to reach a higher post count.
I will try to come up with a different solution for the vault. You need something to cut down on the spam but also restrict the access from everyone. Maybe something like was mentioned earlier. A manually submission to the members although this would be a pain if the forums grew very big.
There migh be other ways to help this out it's just a matter of thinking.