adding benefits to loyal member of the clan

First of all if the title capture my idea or not. My idea is to a grant beneficial achievement to a loyal clan member and by doing that a clan member will likely to stay in the same clan. The loyalty of the member will based on his/her time and war log activity contribution to his/her clan. The more he/she do these clan activities, the more he gain "clan level" or "rewards" which i need to think more about that. And if the member left the clan, that member would loose all of that and he/she may start from zero again.
The reason for this idea is that i hate to see some players leaving or entering the clan as many as they please. i am certain that most of the loyal clan members in the game would despise such behavior too.