Post delay depends on activity. It is negligible in Full Member+ , but for Jr. Member and below, it is a real incentive.
And secondly, don't forget the signature campaigns which every Newbie, Jr. Member and Member is desperate to join. That is the prime reason for which users chase activity.
Exactly. I still remember how frustrated I was for making a post and how eager I was for getting rid of the 360s limit back in the days.
But since I was a member (posting limit < 30s), it never bothers me again.
Once you hit 100 activity, it becomes only 12 seconds.
Beyond that point it drops by 1 second every 50 activity, capping out at 4 seconds at 500 activity.
But really, there is no point. Capping it at 15-30 seconds would make a lot more sense, because if you are posting once every 4 seconds, regardless if you have 500 activity, it is 100% spam.
Assuming the average person types at 60 WPM, 5 seconds would be enough to squeeze out only five words, and that is not including the time taken to read any post at all.