You have self moderated threads which allows the OP to delete unwanted posts. However most self moderated threads that are active in deleting critical posts are scams, this would only make it easier for scams to be successful.
The most common legit reason why OP's of self moderated threads delete posts is because they are spam. It would be possible for the same person who spammed a thread to later make a legit post with good points.
All threads are moderated, just not self moderated
2) people can create own topic in the altcoin discussion section and discuss it without moderation
this really saves a lot of time. this would be good for all of us (except sockpuppet masters of course)
When someone is deleting posts on a self moderated thread (and they are scamming) then people often are going to post their warnings a second time (and subsequent times as necessary).
This would really not work anyway because people could just create an additional account when they get banned from posting in it
this will work because creating a spam account takes let's say 5 minutes. to "ban" this account it takes less than 5 seconds. majority of fudders/flooders/spamers will be gone.
please re-read the topic before posting next time