Uh... http://m.ign.com/articles/2015/04/02/bungie-used-behavioral-psychology-to-make-destiny-appealing ...huh.... http://www.psychologyofgames.com/2014/10/the-psychology-of-destinys-loot-systems/ Behavioral science used in Destiny's design to keep players returning. Weird. Addiction occurs with many things, friend.