Unfortunately not each good post will bring you a merit, but if you wrote ten of them, the probability that you will be rewarded increases very much ...
This system isn't perfect... It isn't also always fair... sometimes poor posts receive many merits and great ones remain without any reward...
When I hear someone declare that several good posts remain ignored and unrewarded, I immediately want to ask the question: what time frame are you talking about? If you`ve written a good post, it doesn`t mean it`ll immediately receive a merit. And don`t wait for it. Sometimes those posts are rewarded with merit, which, as it seems to you, have already been lost on the previous topic pages. But someone may notice and appreciate it. Don`t forget that merit is a completely subjective indicator. Your post can be differently evaluated by various people. And maybe it won`t receive merits immediately, but after some time. Every good statement deserves a merit. And your posts have no expiration date. Someone might like your other assertion and open your post history and stumble upon the observation you thought went unnoticed. Therefore, if someone hasn`t receive a merit within the first minutes after writing a comment, it doesn`t mean his post will never be rewarded.