they are not all experts the guy who was supposed to be the mafia italian american expert historian was just an actor who majored in history in college i checked his website and imbd page he had no scholarship that would prove him to be an expert on italian americans teh mafia or weapons used by the mafia he did however have a cameo on entourage there are plenty of university professors and ex military guys spike tv could get but they are probably not good infront of the camera of aesthetically pleasing yeah some are experts but a lot arent