Are you also factoring in the 'value' of missing:
- important events at home,
- public holidays,
- time wasted in places while obligations/people at home need you?
Allowances? Are you suggesting that people absent on duty should pay for the privilege too? Public servants, military, pollies, businesses and, I bet, even you wouldn't do it so what's your point?
Have you walked a mile in the shoes, or just like to imagine you have? You're sounding like some 'rubber desk Johnnie' who thinks crew go on a holiday every week!