Now what is the difference for a legendary to MERIT another legendary who is already a legendary RANKER on this forum, same goes to other SAME Rankers on the forum.
Because they think that there will be a new rank in the future so they are working for it and getting enough merits in reserve to get rankup when it will get implemented by admin. 
Merit is not moderated and anyone can merit any post, so there is no strict guidelines as well so merits are awarded for the quality post which maybe helpful for the others.So no matter who is creating good post will get merits.