Need before greed in pickup groups?

[Messianic]

My two rules for grouping:

1) Don't expect groups to be generous. They can be, and it's good to try to be helpful to one another for mutual gain; but you can't force them to be generous. We all play this game for ultimately self-interested reasons, if nothing else because we personally enjoy it.

2) Don't assume everyone agrees. Set ground rules on loot from the start. It's no good arguing that you had a different assumption about loot than the other guy - assumptions are worth less than nothing.