I don't make manapua at home because of the amount of work it takes. Consequently, I appreciate that cheap dim sum of any kind comes at the price of exploited workers. The manapua at the Royal Kitchen are tasty, but they are not cheap. I hope that means that the workers get a wage more in keeping with the amount of their labor.
If you're on vacation, go there because the food is good, and you can afford it. If you're local, go there because you will get a good meal AND be supporting an honest enterprise.