Mostly because I feel amazing when I'm rocking the white armor. Second, you can see the other peoples faces and make them happy! that's what I most love about costuming. Making myself and others happy!
I, before I didn't had a stormtrooper armor, If I suddenly saw a guy standing dressed as a Stormtrooper ( or any other star wars character) I'd get crazy and i'd like to take millions of pictures with him! So that's why I troop, because I just know people have the same feeling as I did back when I didn't rocked the white armor!