According to Ignoramus5533 :
What you are saying, in other words, is that their price reflects not
only the production costs, but also costs of R&D etc, spread out among
relatively few produced pieces. Hence the cost.

Right?

Right. Remember also that these things tend to be multiple pole breakers
too. So, trying to see some relationship in cost between one of these
beasties and a single slot 15A residential breaker is bound to fail ;-)
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.