We never saw it coming: high-priced, celebrity-backed headphones selling like hot cakes. The price tag aloneoften upwards of $300, though that's often a stealis enough to make you think twice. When the trend took off in 2009 America was in the midst of recovering from one of the worst economic pitfalls it had ever experienced. And what did people do with their money, they bought headphones. Lots and lots of headphones.