Before LFD, my server had a standard of greed. People followed it.
Then LFD came and there was a mixed period during which some rolled greed and others rolled need, and in all sorts of combinations and timings, so I cannot ascribe it purely to ninjas.
Things seem to have settled down and people are all needing.
But for no apparent reason, I run into a group now and then that greeds. I've found no pattern to it. They don't talk more or less or play better or worse. If I remember, I'll try to find a pattern of servers.
I don't mean one person greeds, I mean everyone. Perhaps it is merely the group following the example of the first. But that seems to be insufficient.
The second person has every reason to need and I doubt social contract is what prevents his ninjaing. After all, I found no pattern of social interaction, these people are just as uninterested in other people as anyone else. By greeding they make themselves vulnerable to the next person needing. The third person can now see the picture even more clearly: need is to his benefit and he can also know that if he greeds, the potential benefit is even higher for the next person. Yet somehow, in these strange groups, there is a cascade of fairness.
The strangest behavior I've seen is rolling greed after a need roll. It's one thing to roll greed along with the rest: that's fair. But to roll greed after someone else has rolled need isn't fair, it's unfair against oneself. This doesn't even appear to happen purely through nearly simultaneous rolls; often they come with a few seconds spacing.
As for myself, I follow the highest roll. If everyone does greed, I do greed. If one person needs, I need. I roll greed for fairness. I roll need out of self-interest balanced against fairness and to reduce the chances of the potential ninja winning so as to ensure that need is not a profitable activity for him. There is the risk that this creates a new standard of need rolling, but as long as that is a standard, nothing is lost.
What do you roll? Greed, need, lowest, or highest? Or do you /roll 1-2 with 1 being greed and 2 being need and go by that? The sky's the limit.