I think this rule should stay, it protects the forum (to a degree) from flaming & promoting hard feeling. Far better to delete an offensive/useless post before it's displayed causing no upset. If an offensive post is displayed & removed after posting the damage has already been done which can then lead on to an unwanted debate, much to the delight of the original poster.
I'm sure we all have been in forums where a particular trouble maker has been banned, only for them to constantly re-register another user account to continue their campaign against the community.
Also there are some that seem to think a high post count is important no matter what! they will persistently post rubbish just to get their count up, why they do this is beyond me
This forum is for support & to discuss Daemon Tools, it's not meant as a chat forum, if left un-moderated too much crap would start to appear.