[yummyfajitas]

The problem is the customers of nonprofits often cannot measure the results themselves.

If McDonald's serves me a burger that is inedible, I know about it immediately and can stop patronizing McD's.

If Burgers4Africa distributes inedible burgers in Somalia, how do I know about it?

[stcredzero]

My point is that often the customers can measure the results. The article is worded as if this applies to all non-profits.