The job of a merit source is different from someone who has an Smerits. Merit source are to merit and quality post that they see on a  board or thread, even if the post is not %100 quality but is %70 upword, they might consider it as quality post and merit it but the number of merits that is supposed to be given to the post will reduce because it's not %100 quality.
But someone that has an Smerits will not merit any post that is not %90 to %100 quality because they believe that they worked hard to receive their Merits, so they will need to see a 100% quality post before they distribute sny number/s of merits according to their choice.