Dr. Dre, one of the most talented musicians ever, is barely known. I trust that you all know him. If you don't, you should jump into a whole.
Now, back to my point.
Why are people like this?
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People hear that they should try Dre Beats because they're good, chances are they've never used any super high quality headphones otherwise so they're blown away by the sound quality, and tell their friends. Repeat. There are some just as good/better for much less, but your average person isn't going to look into headphones too much.