Why aircraft coffee pots cost so much

> safety features like circuit breakers and wiring insulation to protect against onboard fires

A regular circuit breaker is $5. Aircraft-grade one is $20. "Wiring insulation" has to be present in every coffee maker anyway, to protect from user electric shocks. A very high-quality, fireproof and abrasion resistant wire might be $1/ft, so <$10 total for the coffee-maker.

The "$7,000 to $20,000" price is definitely not due to material cost.