Inside and Outside School

I just came back from teaching English to my mother's friend and her daughter. The latter started teaching at an elementary school in October. When I got to their home, she and her mother were working on props that schoolchildren will use at the Art Festival next Sunday. Unfortunately, they won't compensate monetarily these extra hours she spends at home preparing for classes and school events. I think Japanese teachers (especially at elementary and junior high schools) tend to spend way too many unpaid hours and we should correct the current system that puts such an unreasonable burden on them; however, one of the reasons the system is being somehow sustained seems to be that teachers don't think it's all about money.