It is because people like that only think of earning merits for different reasons like increasing their rank to join bounty campaigns instead of thinking how to contribute in this forum or how to make a good/high quality posts then merits will surely come.
Is something I experienced when I first came here, you know sometimes too much expectations makes one to think of having merit in every post you make, but now I've come to understand that when you put much effort in your post and let it slide, the reward will come without you knowing.