But seeing your OP now (I didn't know about its existence before), it would be interesting to see a new metric, based on Merits vs. Activity ratio.
Even better: correct it for Merit per post instead of Merit per Activity. I made
a topic for that a long time ago.
I don't agree with adding merit per post/activity.
Assume that someone asks a simple question. Almost no one will answer that question. Because answering such question doesn't deserve merit and it decreases merit/post (merit/activity).