I watched a documentary that compared loot based games (specifically WoW, but it applies to Destiny as well) to smoking crack. If anything, Destiny is a crack simulator.
edit - which I am personally really happy for. I kind of enjoyed cocaine back in my 20's ... a lot. Destiny is a lot healthier, and cheaper. All these idiots complaining about a $40 DLC have obviously never went through an 8 ball of coke in a day before.
Basically getting loot triggers the same addiction centers in your brain as doing cocaine. According to that documentary anyways.
edit - never got laid for bringing my Gjallarhorn to a party though so I guess cocaine kind of wins.
Well, youre correct about gettig laid but ive been laid more times sober than with any substance in my body. Also, coke is way more addictive than any loot game (i guess it depends on the person too)