I think the hourly wage for chilcare position is very low... but they are providing a great service when the parents are not at home. You cann't count the value of proper caring and education of your child in terms of money.
Actually you can. It's called an opportunity cost.
If a parent stays home and takes care of the kids they make $0. If instead they work at a job the make money but also have to pay for childcare. Let's say they make $30000 a year. If childcare costs $30000 then there is no net benefit to working. I think most parents would assign a premium to taking care of their own kids and I think most people want to work at some job for their own professional benefit. Those tend to balance each other. The net result is that childcare workers' pay is limited by what the market will bear - what parents can make working +/- how they value caring for kids themselves and the other benefits of working at a job.