I can. I remember when these forums were under attack. Each day many new accounts were created just to post FUD. Posts like "BITCOIN HAS BEEN DECLARED A PONZI BY THE FBI!!!" or other crap. Some people claimed that they were being offered money for any bitcoin hating article, blog, or post they created. These posts eventually became more common than productive posts.
5 posts and 4 hours is the mildest option to combat this problem. I like the idea of being able to read for free, buy paying for posts. It weeds out the kids and idiots. (Idiots often have no extra money, as they have lost it via idiocy).