I have a other great idea (i am a great thinker ;) jajaaaajaj)
Imagine a "robber of gems". A robber that his cost is high, very high, but he can steal the box of gems the others players if they haven't collected this box of gems. Yes, i know, it's a bad joke but this would give a interesting vision to players that don't value the box of gems and it would be very funny for all of us.
Thank you very much for not throw me into the sea with the sharks ;)

