Microfinance that pays you back?

I know there are lots of great micro finance charities like kiva, but I was wondering if there are any similar projects that actually pay you a return. For example, I have a major investment in lending club loans, but those are for people to buy mustangs, make home renovations, pay off credit cards, and other unimpressive desires.

Are there no similar services that provide loans for growing businesses in the developing world where I can expect a return? In other words, not a charitable donation, but a for-profit investment you can feel a little better about. And if you lose 50% of your investment, you’re still doing better than the stock market! :P