I have seen many beginner tried to do the best, but they not get any merit, so they will not participate at this forum anymore.
A lack of merit does not hamper their ability to participate in the forum whatsoever - it only hampers their ability to be paid for their signature space. If they are leaving for the sole reason that they are not receiving merit, then their only reason for being here was to farm bounties. The merit system is preventing that, and therefore doing what it was designed to do.