Few people from minority cultures are crazy enough to bother. Most of them want to do sane things, like make a good living. If these stories are going to be retold, it will be mostly up to lunatics like me. Travelers carry them from that culture to another, where storytellers adopt them, adapt them, and spread them through their own cultures. Then travelers carry them on again.
Few stories belong exclusively to the culture where they are found.
Most are told in different versions all over the world. My job as a storyteller is to take good stories wherever I find them and pass them on. I'm one of those people. I may have been brought up in a particular culture, but my heritage as a human being includes all the cultures of the world. If you don't know the stories, let me introduce them to you.