Luck has very little to do with getting merits. If you make a merit worthy comment in any of the newer games, it's almost guaranteed that a mod will see it. If you make a merit worthy comment in any other (older) game, it is just a matter of time. So no one gets a merit by luck, rather, the chances of a mod seeing it are better in the newer games and worse in the older games.
@theone,your not supposed to ask people to vote it up for you.What you do is you make merit deserving comments on newer games,and that way they will get awarded sooner.Doesn't anyone pay attention to the guidelines?