Value to any employee depends on flexibility. Not just where and when, but what you get on-board. Look back on all the threads:

• Complaining about being upgraded into a middle Comfort+ seat
  
• Complaining about not being able to select a seat in advance
  
• Complaining that a special meal wasn't loaded
  
• Complaining about not getting one's first choice of meal
  
• Seeking an op-up (op-up!) for two

Then recognize that non-rev travel has not just limited availability, but rules:

1. Don't complain about seat assignments
   
2. You'll get a meal if it's available
   
3. Don't argue with or question GAs or FAs if there's a problem
   
4. Observe the dress guidelines

http://travelinfo.delta.com/dlnonrev/TravelGuide.htm

No small number of FlyerTalkers in this forum show they couldn't handle it.