I really live a simple life and don't need very much to feel good and happy. Don't get me wrong; I believe you should get what you earn. Sometimes you have to fight for it.
Confidence, knowing for certain that the person making the call has your safety foremost in their mind. And knowing that the job you are about to take on is the right thing to do, that it makes sense.
In a costume, you need very exaggerated body language - as you say, sort of mime-type skills.

