Yes, some of the points in the article made sense. Although it still seems high. I'm thinking those people must be married to the job a bit, esp with 80 hours/week.
Or that the management better make them happy. I was thinking someone could slip an extra note onto the last page of a music score out on the stage for a performer, something like, "Aren't you glad we left this last page in here? Support your stagehand union." There would be a lot of room for "mistakes" in a job like that where no one is to blame.