I would guess that Belle of the Boeing isn't referring to the actual working conditions but maybe the salary. And before you all jump down my throat I know the salary is the same for everyone but in terms of cost of living the the exchange rate against the pound the salary isn't very good. Its not easy to save any money and still have a life outside of work. Its fine if you want to take as much food off the aircraft as you can and not leave your hotel room when you are down route but that's not for everyone.
This would also apply to people from places like Australia where they are used to a good way of living.
Could be wrong but think this is along the lines of Belle of the Boeings problem.