I used to (co-)lead clans in other games some years ago. I stopped it because it's too much effort for me, and actually I don't like being tied to a clan at all.
But during my time as (co-)leader I always kept an eye on my members, and tried to make my clan a GOOD name in the community, so all the members had to behave both on the servers and the community forums. If I saw someone insulting other people ingame, using glitches, or writing shit topics, especially like this one, which is related to the clan, the particular member would have been the longest time in the clan.
Just want to mention this. Some clans don't care for their reputation, but then they shouldn't wonder why noone takes them seriously.
Edit: and yes, I think yu can judge from one member to the whole clan very well. Birds of a feather flock together.