What the system really boils down to is this: at some point your post count MUST be equal to or greater than your time score to earn the highest possible forum rank.
Examples:
User 1 posts 1 post every 2 weeks. He joined 2 years ago. He has a potential activity score of 728. His actual score is 52.
User 2 posts 14 posts every 2 weeks. He joined 2 years ago. He has a potential activity score of 728. His actual score is also 728.
User 3 posts 100 posts every 2 weeks. He joined 2 years ago. He has a potential activity score of 728. His actual score is also 728.
User 4 makes 1 post today. He joined 2 years ago. He has a potential activity score of 14. His actual score is 1.
So far the best post that helped me understand the essentials of activity and posts...
Thanks johnnybravo0311 sir