Volbeat probably act like major rockstars because in Europe they're pretty much the most popular rock band around right now. They headline 50,000-person shows over there. Here in the US they've been trying to gain a bigger following and they probably overestimate what they've done.
10/17 - Machine Head/Battlecross
10/31 - Killswitch Engage
11/28 - Slayer/Exodus/Suicidal Tendencies