Well you were talking about the percentage of merit receivers when you mentioned the 0,02% figure, so the base in that context is of 25.008 forum members (all merit receivers) and not 150K. In addition, 500 people is closer to the 50% ratio, not 200.

Regardless, coming across decent posts is not trivial, and one tends to favour certain sections and posters, often because the content they provide is way better, and easier to read in a linear manner.
In an interval of around a month, 53.858 posters have created 796.538 posts. 309K of those posts were created by nearly 37K Newbies. Now the content produced by those Newbies is nowhere comparable to that produced by the top 200/500 posters. I’ve just gone through the posts of the list of top 25 posters of the month, that are Newbies or Jr. Members, and all their posts are social reports and spam one-liners. If I were to do the same with the top 200/500 merited users, the difference in content is going to be crystal clear.

Anyhow, if there is an issue overall in my opinion, it’s that ranking speed in general is extremely slow now for the immense majority, even if they are merited. Heroes for example must exasperate at getting a few merits every now and then needing 500 additional merits to reach their next rank. Heroes received an average of 1,96 merits per poster last month. From Hero to Legendary takes 255 months at that rate (21 years).
The issue is not that the best posters get lots of merits, but rather that it is difficult to rank (for those that wish to rank) at a decent enough pace, preferably in the span of their lifetime.