They're trained to serve the Commonwealth.
The Queen promised to serve England and the Commonwealth until she died.
At 87, she still works full time.
I think Americans probably don't know enough about them and perhaps think they live some type of story book life.
After I saw the King's Speech I delved into their own sites and was shocked to discover how much land they still control, and derive a living from, off the backs of others. I am not saying they don't try to serve, as the elite here try to also. I just believe it is arcane to keep living under the fantasy that someone was ordained by God to rule over others.