For me, the role of camera man gave me something to focus my energy on. Just sitting there caged and watching was almost too much to bare. I cum so easily the slightest pressure against my chastity cage could release my tiny orgasm.
Wife and I have found by having me take pictures I can still enjoy watching yet be moving around thinking about best angles, lighting and other considerations to make them look their best.
Also, having mementos of her adventures is an amazing benefit. On my monthly orgasms I am often allowed to use the pics to masterbate. As you would expect it only takes a few moments for me to cum when viewing such erotic material.