Bah! I dont buy into this shit, for the few who have a chemical imbalance it may fly, but for the most part I feel this type of explanation just allows people to sit back and say "I have a problem and its called bigorexia". By giving them a reason/excuse, naming the problem allows people to avoid facing it because if they fail they now have something to blame it on.
I for one am anything but obsessed. Sure I like to lift and like to hang out on the boards etc but my life is also filled with a lot of other interests. The fact that most people seem bigger to me is simply an observation and not a driving force forcing me to juice my life away and sacrifice my life with a single goal of getting big.