1. Relatively weak players will not be afraid to participate in the tournament and lower the clan's rating. (i.e., this option will not affect clan activity in any way)
2. Weak players will have an incentive to learn in order to be among the top three.
3. Clans that do not have 3 representatives for a particular version will have an incentive to invite strong players, or (preferably) to develop their own champions (which, in my opinion, is the most important task for all clans).