It is cost of living comparison. She doesnt have to pay any expenses here, and it is actually the going rate for live in maids from abroad.

Granted she was with him for 4 years he should have given her an increase if he felt she was so valuable. I also dont think he treated her 'too good' as suggested as he never gave her a raise.

Live out maids make a small fortune, they will take what people will pay, plain and simple.

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"Diplomacy is the art of saying 'Nice doggie' until you can find a rock - Will Rogers"