Kindly consider the cost of a tired crew making a fatal mistake and the "insurance" provided by first class quarters is rather cheap.
What's a Herc worth these days? Let alone the passengers.
To be fair, years ago I made the same mistake in being outraged when Helicopter pilots detached to our battalion politely declined our offer of Mess accommodation (and refreshments we would have tried to press on them) in favour of a quiet night at a local motel.