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If you want someone to value something, make it difficult for them to obtain. I'm talking about clan leaders right now.
A leader is a position of honor and responsibility. The requirements for candidates should be appropriate, both in terms of their tenure and their tournament experience. I propose allowing clan creation only for people who have been registered for at least 3 months and have participated in at least 3 official portal tournaments. A prize-winning place in a tournament could be rewarded with a reduction of the "trial" period to 1 month and 1 tournament. The clan is automatically disbanded if none of its members have shown "heroic" activity in the last 3 months. "Heroic" activity is considered to be participation in portal tournaments, hosting them, creating maps for them, writing manuals, etc. Moderation, RPGs, and various contests do not count.
Adopting even these simple requirements (for active clans) will sharply reduce the amount of "dead weight." Further requirements can then be made stricter.