Just going back to @diddl's questions,
My thought would be did PA know enough to need protection?
If not, would JE care enough about him to protect him?
I think JE liked having Andrew and Sarah dangling on a string, just for the laughs and the benefits of their society. But I think he despised them. Their debts were chump change to him, but he never just paid them off - he 'negotiated' them down, made settlements on their behalf, that kind of thing. He kept them very obviously in his debt, and he made sure they and others knew it. He played with them like dolls, like a royal Ken and Barbie.
It really was untenable. But it was happening right up until JE's death.