The same with you, I think it should be done just for fun. Don't take it seriously and just place the same amount as others would do. It's best if it's cheap so that we can move on easily if it loses. I don't like the idea of going all in for collective betting. $100 for each person and if you are 10, is already pricy. $10 will be fine, and I think many could agree with it easily and they would not mind if it will be taken to voting on what team to bet for.