Performers with first class reputations generally have first class chops, I've found when meeting other performers. That aside, if one is arrogant they had better do a perfect show everytime out of the box. No excuses. Because no one will cut them any slack if they slip up. Also, being involved on a concert committee as well, when given the choice of hiring someone talented and nice, or talented and difficult, we generally pick the nice one. Being civil to the volunteers is part of the job.