Digital read out static meters

Why are these so expensive? They should be under $50.
Why does it matter? What I mean is, why do you even need one?
for cd static charge ; to prove it exists/ to prove the remedy worked.
Easy solution. Don’t buy a meter.

Do you know what goes into one? ... the BOM cost at the quantify manufactured? How about the amortized engineering costs? tooling costs? Sales and marketing overhead?

Do you work for free?