Not quite so naive, but maybe selfish
Partly agree 747-8. However, I think there is some depth to this issue.
For the girls, it probably is mostly about money.
However, for me, it is about rest. Not so much for the 1 pattern a week to Milan where they get 24hrs, but in a few years time, when the thin edge of the wedge is now all the way in, and every pattern to Europe is 24hr rest for the girls. Cumulative effects can be quite insidious.
When I order an evacuation, I'd really like to have alert cabin crew activating the slides, and getting the punters out. On a personal, and admittedly selfish front, I want the girls at the door, or doors, right behind the cockpit to be alert.