You are wrong here.
Posts made in "Serious Discussion" and "Ivory Tower" boards don't increase your post count at all.
For more information, see the post made by below.
- Posts in Serious Discussion only activate a potential-activity period. They do not increase your post count.
- Posts in Ivory Tower neither activate a potential-activity period nor increase your post count.
Dammit! It all were in the mind and I did not crosscheck before making the post. Was I right about Investigation board?