POL.777
The point is that I wouldn't be content flying for a living knowing that when it comes to home time, I'm effectively living on the breadline.
Equally, it is certainly no requisite:
"to work for free, and keep smiling while you are doing it."
That approach is simply unfeasible and a total insult to the value-added work performed by flight crew. However, if you are willing to work for free and be able to keep smiling (and eating/drinking), I'm sure most employers will love it.