You can always activate the "show post count" in your profile, so the real number of any user posting activity will be shown. Now, about generating more "branding", well I think this is absolutely unnecessary. All here know who are good and bad posters, and each board has their bests and worst. I mean: not all the boards are equally merited and it doesn't mean that the poster is worst. For instance, the technical one, the more dedicated to bitcoin is used to receive far less merit than Meta, despite the users knowledge about the technical stuff. So, the quality of an user cannot be measured by the relation between activity and merit, but by your own personal preferences.
This is impossible, then, to create a system to determinate the quality, for many factors are included and it goes far beyond numbers under a profile's name.
From my perspective, the merit is kind of "trendy-based" and yet, some of the most-rewarded subjects can be just a result of that trend.