How do you enforce the 10% salary tithe?
One obvious difficulty in educating children for free and then expecting them to pay you back after they become educated is that, most places, minors cannot enter into legally binding contracts. So the kid graduates, gets a great job (in a country that won't recognize the contract), and says, "I never agreed to pay you 10% of my salary, so I'm keeping it."
Depending on your country, even adults can't under a fair number of conditions. Having very unequal bargaining positions, for instance, violates the idea of freedom of contract - which will render it unenforceable in some places. I think it's called undue influence.
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.