What does it have to do with "Capitalism" per se?

If you have a well made, but very niche product that sells in very small volumes it will be expensive.

If any of the labour & assembly happens in US that turns it into unavoidable inevitability.

If it was cheaper, it would be a loss making hobby.

A country without "capitalism" wouldn't make such product for sale to begin with.

maybe a society which has laws and regulations voted by citizens (anarchy for example) commercial products shouldn't profit over 700% or some absurdity which caps the 5000 usd number... it's not like velocity sensible keys are expensive or overly complex to produce

micro-tonal instruments are prevalent in various cultures which weren't flooded by Europe and then North America by hundreds, if not thousands of years ago. it's pretty easy to find examples on countries inside Africa and Asia