I think the possibility to transfer coins from teams after the event has ended would be a good thing. Sometimes we have surpluses of coins, and/or loose coins in the teams that alone amount to nothing. If we could send it to a team in the end of the event, so it doesn't count to the rank we could use it. Since the stars are a product of cards and so on we spent I think it will be a nice gesture to have, plus having surpluses in one team and the others with something still that we could collect just looks like a waste.