The way I see it, parents have obligations regarding their children, but not the other way around. Children didn't ask to be born, it's the responsibility of their parents. I don't think it means that parents should sell their houses for their children, though. Parents are responsible for providing an adequate standard of life and ensuring that their children obtain basic education. Then it's up to parents how much they want to help and up to children how much they want to take care of their parents when they get older.
Viewing children as an investment into your own future is very egoistic and pragmatic. I don't think it's a good foundation of a healthy relationship.
Yes, parents are obliged to send their children in school and get quality education, and when they graduate from their respective courses and land into stable jobs, children in return have to fulfill their duty to take care of their parents when they are no longer capable to work. Although children are not actually required to give back to their parents, but as a responsible daughter/son, one should never ignore their parents sacrifices but should treat them like they are worthy of the love and care from their children.