[size=medium]Diminishing returns isn’t something that starts at a certain number (dollar figure) it is a constant, albeit with headphones a constant that is affected by variables; primarily preference to certain sound signatures. That is to say that obviously not all $200 or $400 dollar headphones sound similar to each other, nor do they even preform at the same sound quality level. Closed versus open, efficient and non-efficient, bass focused, treble centric, the variables are many.[/size]
[size=medium]Considering diminishing returns, as a generalisation, the difference between $1000 headphones and $300 headphones (keeping in mind sound signature variables) isn’t considerable. Is it worth it? That is the subjective question that each person has to make. The answer to that question is also based around many variables, not the least of which is disposable income. To a 16 year old that is still at school, $1000 dollars is a fair chunk of money, to a person struggling to pay their rent or mortgage it is or should be, prohibitive. To a person that has a steady job, is in control of their house payments, and has a $40,000 car etc. then $1000 isn’t a big deal (probably owns a $2000-$3000 plasma/LED TV).[/size]
[size=medium]Regarding the speaker/headphone comparison, they are chalk and cheese. That is like saying that once a motorbike gets to $20,000 you might as well buy a car; they are simply different rides.[/size]
[size=medium]Diminishing returns applies to almost everything in life, from food, to fashion, electronics, weddings, holidays and especially hobbies and past times-there is no one answer to the question-“How much is too much to pay for headphones.” It is very subjective.[/size]