I was more interested to see the stat for Hero and Legendary users and as I expected it's not many. Out of many its only 17 (8+9) which gives a clear indication that this is a very hard ratio to chase.
True. The more time passes, the more posts a user has. And the more posts he has, the more difficult it is to keep the pace with having same number of earned merits.
It's for some reason in particular, or I still haven't reached the records needed to be included.
You could not show up there. Perhaps you did not pay attention to what the statistics present. The users mentioned by Ddmr are those which have more merits than posts (not more merits than activity).