I'd bet eunuchs had a high suicide rate too. Not sure though. The rich probably consider that an acceptable loss. For taking out the competition, that is the main reason for all wars of history. They could do that now but people have been getting more and more anti war starting with vietnam. And a real large scale hot war can and has in the past gotten out of control and spiraled into a revolution where members of the nobility have been killed. People won't willingly become a eunuch/transgender, not in a vaccuum. How do you get them to do it? Get to them young, like with circumcision, or use years of propaganda to brainwash them into doing it willingly.