Randomness

People will buy anything if it's expensive enough. I think the impulsive spending of money just perpetuates stupidity in people.

Take the Birkenstock conspiracy for example. It all started when one kid went out and decided to pay a hundred dollars for some ugly sandals...
Kid's friends: Wow, those are some ugly sandals.
Kid: Yeah, well, they are expensive, ugly sandals.
Kid's friends: You paid a lot of money for those?
Kid: Yeah, well,uh.. but they're comfortable!
Kid's friends: Really now?
Kid: Yes, they are more comfortable than any other shoe in the entire world! All other brands are shamefully inferior to the comfort of my Birkenstock!
So, the kid's friends all go out and buy Birkenstocks, but when they find out that the Birkenstock is just another shoe, they start to feel a little foolish, but then they attempt to justify their purchase to others, who then go out and buy their own Birkenstocks. It just perpetuates itself like that.
I know; I was a victim myself.