According to the story, servants only earn about $64 to $161 per month, which is too little. Author also opines that if someone cannot afford to pay more for domestic help then they shouldn't have domestic help.

That's easy to say. That's like saying it is better to starve than work for $64 to $161 per month. If that's the most the employer can afford to pay you, why wouldn't you take it, as opposed to starving?

Indian salaries are low across the board. A school teacher may get paid around $320 per month. If that school teacher wants to hire domestic help for $160 per month, and the alternative for the would-be servant is starvation, what's wrong with taking that job? What's wrong with the school teacher hiring that help?