It’s Company Policy
I saw a flight attendant berate a man because the airline employees boarded before the passengers. He was angry because he had “paid for Business Select! Why are they boarding ahead of me when they didn’t even pay anything? The flight attendant replied that it was company policy. Many were actually working, and needed to get to their departure airport.
What’s so important about the fact that there were only three people on the plane? He complained and whined to her for about 10 more minutes. It was because there were now only 140 seats instead of 143.