The most interesting thing (to me) about videos is their ability to demonstrate the nonprofit's or charity's ideas and values through body language. I think this humanizes and completes your digital ecosystem. When people come to you they will encounter more than just text on a page, menus to click, and photos. They will encounter a feeling and a completeness about you. This helps in trust and decision-making.
Remember that text is only ONE way for people to experience you (plus it's a bit excluding less literate or non-English audiences). In communication, we rely on more than text. Video does this.
I explain this in more detail in this video (under 3 minutes):
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