I think the best approach is to arrange the game so that players are rewarded for acting in the appropriate ways. I saw one game where to level up you had to c

I think the best approach is to arrange the game so that players are rewarded for acting in the appropriate ways. I saw one game where to level up you had to complete tasks that included social components (like helping another player). Rather than needing to pay someone real money to act, you can probably pay players in XP or in game gold and they might even think it's fun... I could imagine having a very small number of paid actors for key roles, maybe the two opposing kings of a region or something, but eve online doesn't need to pay the heads of corporations, and plenty of interesting stories emerge naturally.