For
Legendary we know already >
Amph = 28889 posts but guess what, he got only 1 merit

Interesting that for 28889 posts he only earned 1 merit. I was going through his posts and he is definitely no shit-poster. His posts are generally reasonably good but just really short so don't attract merit.
Some people spend most of their time just in the miners' sections. And end up posting more on some of the mega topics related to pools and equipment. And these users end up being unfamiliar with the rest of the forum. They are more interested in altcoins that are mining. Not so much in Bitcoins.
Not writing shitposts is not enough to earn merit. It is necessary to go to the sections where there is abundance in the distribution of the merits, like the Meta section.