NBC also reported this was the pilot's first day flying for this particular charter company, so this may have lessened his willingness to challenge a company customer.
Other press stories -- hearsay to be sure -- say that baggage handlers reported the luggage completely filled the back bed of a pickup truck. There was a video film crew on board, and their equipment plus the wardrobe and other stuff used to shoot the music video could have resulted in a lot of excess weight.