But those initial medals came from somewhere...from someone who had medals and who thought that that person was fun to play with or trustworthy...which means that they deserved them. It would be almost impossible for some complete OOC person who only cared about their "OOC clan" and only played with them to ever get enough medals to pass them around to the clan.
You can't have it both ways...either your hypothetical person is an evil clanner or he's fun enough and open enough to get medals from people who have them already.
It is said that the most evil are those who can appear to be most good...
