I wouldn't take those odds and I enjoy a good gamble.
Your posts will need to be "good" at least in the eyes of a potential meriter. You will also want to make sure you are on topic in the thread, just because Merit is in the title doesn't mean it is the place to ask about merit.
You need to figure out why you want Merit, is it just to make more money from your signature campaign? If so you will never get there. There are a few threads that try to give you an idea, most of them center around putting in effort to become better than you are. Not meant to be rude but you need to develop enough knowledge to contribute to a conversation or even help someone. You may also try and check out your local board, I know the posts don't count for your Sig but there is a better chance of you posting something meaningful in your native tongue.
You can start here for a guide