I'm surprised Supercell don't do this. It'd be a great way to give back to the community and mix up the higher leagues.
Once a week Supercell hold a Lottery, you can enter the Lottery by paying for a ticket with gems (Say 2 gems for one ticket). Then the lottery gets picked with an entrant being pick out of the hat as the winner. The winner receives 100,000 gems.
Finally, I should win 100,000 for this awesome suggestion!:p

