JOKA_ on 30 January 2016
Relevant: Bungie hired a Behavorial Psychologist to help make Destiny addicting.
http://www.ign.com/articles/2015/04/02/bungie-used-behavioral-psychology-to-make-destiny-appealing
Edit: Actually it looks like hes been with Bungie for a while. Article from him: http://www.gamasutra.com/view/feature/3085/behavioral_game_design.php
Platinums: Red Dead Redemption, Killzone 2, LittleBigPlanet, Terminator Salvation, Uncharted 1, inFamous Second Son, Rocket League
