In my opinion it's actually the most useless thing in gaming. It really boggles my mind why anyone feels the need to platinum or 100% their games, especially when it's not something that can naturally be done through the game. Going out of your way to do some asinine task in order to get a jpeg of a trophy seems strange to me.
But for those who do, more power to you.
But for those who do, more power to you.