Get a bunch of capital.
Go to a poor country (specifically, a country where food and buildings are cheap).
Build a great big school.
Offer the following deal to parents of gifted children: they send their children to you, and you'll educate them for free, for ten years. At the end of ten years, the newly educated young adults either go to college, get a job, or be a bum. If at any point they do start working, you get (say) 10% of their income for 10 years.
Do it smartly: Skimp on "humanities"; no ancient literature for these kids. Reading, writing, math, science, programming. Get them ready for future jobs by giving them deep, versatile, malleable skills.
Do it cheaply: Use technology as efficiently as possible, so you don't have to pay for too many instructors. A campus wide internet connection and a $100 netbook per kid should get most of the possible value; maybe have some real computers for the programmers. Obviously you still need some instructors.
Do it morally (this might rule it out completely, since you are kind of creating indentured servants, and also because you are sucking cognitive resources from that area).
Profit!
This is feasible because the biggest resource is still human cognitive resources. I'd bet that poor countries have untapped smart brains.
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."
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.