Why are there so few biographies of nonprofit leaders?

There's a biography of this guy ...

There's a biography of this guy ...

Business people. Artists. Athletes. Politicians. Religious leaders. There are biographies for these types of people coming out the wazoo. So why few biographies of nonprofit leaders? Surely in the course of the last century a few individuals have left their mark. Why is it so hard to find them?

Case in point: Do a search for "biographies nonprofit leaders". You'll get loads of tips on how to make the bio on your website better. That's not the case for any other sector.

The nonprofit sector won't get the kudos it deserves if we don't even know who are own heroes and icons might be. Someone fix this please. I promise to buy!