Also, not to open up a can of worms here...BUT....
...Since when is anyone forced to do a job they do not want to do? Or forced into receiving a salary they think is unfair? If the maids/housekeepers are not happy with the salary they make they are free to find a hotel that pays more or get educated and obtain other skills. If the hotel pay is low, then they would not have many takers for open positions..and they would eventually have to increase the wages that are paid.
Like, I moved to the States when I was 12. I spent a few years working at a bagel store making minimum wage. I quickly learned that this was not a viable career path for me, so I went to school and got a degree. Now, I didn't go to Yale/Harvard/Princeton...etc...I went to a state school and was not up to my ears in debt, so it is possible to get a degree that doesn't cost a fortune. Now I feel I get paid pretty well for my age.
I also have a friend who dropped out of college, and is working at a post office, soon he's going for supervisor training.
And another one who's in college who works for Costco as a manager.
There are many paths to a better/wealthier life, and I don't see why it has to be in the form of tips...as a form of supplimental income.