That's why I proposed to declare upfront that the money goes to some worthy cause instead of splitting it. This way they could avoid the gaming - ie subscribing to the team and doing nothing in hope that others will do it for you. I think the apathy of big teams comes from the feeling of unfairness. I've seen somewhere an article with the thesis that people would sacrify their own good to punish what they see unfair, this is in our nature. So the only way to motivate people to do something in a big team is to show them that there cannot be any unfairness.