A merit is when you write a very long comment. Not book-length, but a nice thing for us to read.
No. If you write a long comment, you have written a long comment. You don't write a merit, but presumably, you go read the actual FAQ to find out what it really is, instead of making up stuff.
I asked that before and a guy just said this has came up before search the history and then some moderator closed it
Because there is no reason to make duplicate threads about something that has already been answered fully. You know, on the first page.