I don't think many people actually care solely about the rank, but more about improving at a game they like to play. In Mootinie's case, he is always trying to improve to be at the same level as his friends. I don't think he cares as much about the rank itself, but more about the skill level he is at. While the rank itself is a "sticker" which can be used for bragging, knowing you are improving at a competitive game you like is more rewarding.