> all territory is split up among the different crews That's probably not that much due to negotiation, but because smarter team tips off police about criminal

> all territory is split up among the different crews That's probably not that much due to negotiation, but because smarter team tips off police about criminal activity of competing team, and competing team ends up in jail. I would guess that more aggressive team is more likely to end up in jail, which causes natural evolution toward less greedy teams. Still, stealing is a stupid choice for people capable of running efficient organization.