I post a super high quality comment once. I thought that comment is gonna be huge, inspiring every body in this forum. So I check that thread for quoted reply or maybe some merit in the next day just to find out my comment is gone. They delete my "high quality" comment!!! 
Maybe you think that's your best comment, that's your judgment! If your comment is deleted then your comment is less qualified or spam. To get the merit is now very difficult even a good comment and quality will not get any merit, it has become a game from the forum.