I still think this is how people are sending merits on the general boards, so it is not bad either on local board at all. Some people give higher merits on the general board than 6 merits. There is nothing bad about this at all.
I will advice you not to ask this kind of questions next time so far you are giving the merit to quality posts.
Not every one, only few sources with more than 500 monthly allocation gives that much trying to burn out their sources - everyone likes to do that but those of us with limited sources try to manage it so we don't go out of it easily. I like to make my decision based on what the community wants, I'm running an open system so I think the question is valid in this context.
However, my concerns are you subjective classification of quality post, some times I make good and appreciable post in just two to three line and sometimes I write walls of text. It's very difficult to understand your perspective of quality post.
A one liner direct quality post is worth more than a wall of text with repetitive words. Quality is not by the length of a post but the value it gives.
But do sourced merit actually do expire?? Only do see such statement but have not seen any post of merit source talking about their monthly sourced merit expiring instead I do see the ones who parade up to 4k+ Smerit.
I don't know how to explain this to you - if you're given 10 and manage to exhaust only 5, you get only 10 again the next month, the other 5 doesn't roll over.