Now why would famous people love doing photography? I don't know. Everyone has a different answer. But for me, I love photography because of its ability to capture an image in a fraction of a second and tell a story about it. Life keeps on going, but with a camera, you freeze a moment in time that might not happen again. And in each moment of time, there is a story behind it. And sometimes the story is not what the photographer intends to show. Sometimes the viewer of the image fills in the gap based on his experience, his attitude, his knowledge and his sensibility to come up with a story completely different from what is being depicted, and that is what makes an image so powerful.
https://www.digitalcameraworld.com/features/famous-photographers-celebrities-who-also-take-pictures