Desparate times lead to desperate measures. It can't be easy for someone on less than 1000QR per month and there is not one single justification for paying somebody that amount of money. I have heard all the arguments before regarding how much that money is worth in their home country etc.
I do not have a maid for that reason entirely. We have a lady who comes round once a week to do the cleaning for about 4 hours. I pay her 250 rials per visit. This is how much I would expect to pay somebody in the UK to do the same job and that is how much I feel i would need to do it.