Are any headphones worth $11,000?
They are, if that's what they're worth to the buyer.
Look, I'm not trying to get all philosophical about the meaning of value. I'm just suggesting that plenty of people will spend thousands of dollars for a diamond ring that doesn't "perform" any better than would a $75 fake.
I wouldn't suggest that these people are crazy. They've decided that there are intangible emotional benefits to owning the expensive ring, that are well worth the price.
Similarly, there are people who have decided that they'll derive some sort of emotional benefit from owning an $11,000 pair of 'phones, that couldn't be obtained from a $200 set of 'phones.
(Moreover, the $11,000 headphones probably do perform really, really, really well.)
I have friends who just dropped $14,000 on a 6 week vacation to Africa. They don't appear to regret spending the money. I have a relative who owns a 41 foot sailboat, which not only cost a fortune, but which requires serious money to be spent on it each and every year. My relative loves the boat, and would probably tell you that buying it was the best decision he ever made.
The point being, if spending a lot of money on something that most people would consider a foolish expense brings you joy, then _to you_ it's not a foolish expense.
Me? I like wristwatches. To me, spending $19,000 on a Lange 1 seems like a perfectly rational thing to do (assuming one can come up with the $19,000 without forcing the children to go hungry or something like that). Most other people think no wristwatch is worth $19,000, unless it comes with a new car. I also like fountain pens. You ever try explaining to a non-pen person why a Pelikan 1000 is worth $300? It's no easy task.
Different people derive pleasure from different things.
To each his own.