I don’t think it’s different actually. Sure, jumping from a 20$ keyboard to a 200$ one makes a massive difference, but from 200$ to 2000$, the benefits are marginal, (outside of aesthetics). Similar comparisons can be made to any category of audio equipment.
I'm not saying it's not marginal, but if you spend time around audiophiles, they make lots of claims that aren't just "marginal" but simply not based in reality. I would not spend $2000 on a keyboard, but I believe people who do are doing it largely based on aesthetics, not the kind of imaginary science that audiophiles do.
