This doesn't affect newbie or low ranked account from spamming
There are quite a number of user(s) with high post counts but barely any merit
But they are still junior member or member
Which changes nothing is their rank is supposedly reduced.

I have seen users that make quality posts on the economics board but not all are opportuned to receive a merit.

The thoughts behind your idea is noble, maybe one in an hundred. Too easy I know but wouldn't affect traffic much.

This doesn't stop account farmers from keeping their rank though