To get the picture he had to buy the camera, configure it's settings, select a lens, build trust with the monkeys, create an environment in which the picture could happen, examine all the pictures in the camera, curate those pictures and select ones worth publishing, apply filters, sharpening, etc to the image and then publish it.

Basically, there are very good reasons involving a lot of skill and hard work as to why he had that image in his possession and you didn't, and he deserves compensation for those reasons.