This is a pretty apples and oranges comparison. Suppose it takes 30 people to maintain the ship. 70 people are working on it, mostly doing administrative work that makes them feel important. 10 people decided to fuck off and form a band, but honestly we kinda like them. 10 people developed space sickness and are useless. 5 people snuck on board accidently and got shot into space and nobody really liked them anyway. And the final 5 keep talking about their start-up, whatever the hell that means.

We'd jettison them, but we kinda want at least 70 people to run the ship and we have supplies for 100 people that honestly just burn sometimes.