I have no doubt that he earned some of what he has. But I have doubt that his work added enough value to the world that he should be so extraordinarily wealthy.

I have no doubt that he earned some of what he has. But I have doubt that his work added enough value to the world that he should be so extraordinarily wealthy. The scientists who discovered, and started producing Insulin probably added more net value - yet I don't think any of them became a billionaire as a result.