I can't disagree with him too much. The only point I'd add is that there's some variation in headphones and that some sound better than others. But the reality is that this stuff is cheap to make and the profits are high.
The funny thing is that some people here scream and rant about amplifiers. But amps actually have high cost parts inside and significantly more labor.
ClieOS, that's why you never, ever buy a "luxury" or "prestige" car. A $70,000 car really doesn't cost much more to assemble than a $15,000 car. There's a bunch of superficial stuff (leather, etc.) and sometimes the interior materials are deliberately cheapened to make a car that costs $10,000 more seem more appealing. But I only buy economy cars new - they tend to be simple, bulletproof and efficient. If you want a "nice" car, get an old one. Those hold value, often appreciate, are dead cheap to keep running, and get much more attention than any $70,000 new car.