I’ve drawn-up a quick merit per post ratio for forum members that:
-   Had been merited on the 25/05/2018 (oldest merit snapshot I have without getting into backups, but it serves or purpose with over 7 months of data).
-   Have created at least 200 posts since then.
I’ve created a merit per post ration for each of the above set of forum members (see https://docs.google.com/spreadsheets/d/1nyaHbaz31aVf6dnnTjiPOuCflZv1UOxNSWTQVMMUt68/edit?usp=sharing).

In summary we get:
-   There is an unknown (by me) number of users that have posted at least 200 posts since 25/05/2018 (unmerited ones I mean).
-   21.808 forum members had been merited on the 25/05/2018.
-   3.679 of those have posted at least 200 posts since the 25/05/2018.
-   1.219 of them have an average >= 0,005 merits/post.

So really, only 1.219 forum members meet the criteria of having 0,005 merits per post on over 200 posts since 25/05/2018 (*). That is a pretty reduced set …

(*) Well, really there is an additional set made up from those that had not been merited yet on the 25/05/2018, and have since then + created >= 200 posts, but I needed an initial snapshot to retrieve the post and merit count from.

Edit: One can also manipulate the merit per post ratio by deleting posts.