Well, I think there are points getting missed here. Several folks seem to come down more on the regulation, or the market, or the production costs side.
They are all factors here.
Unlike with certain Euro-products (think FN FiveseveN) we have relatively lower governmental associated costs.
We do have relatively high labor costs, and that's just the way it is when you are talking about life in a modern first world nation. We can't afford to live on the same amount of money that a guy in Brazil or China, or India could live on.
Finally, the market. Look, it does come down to market prices inasmuch that people establish how much they will pay for a product, and if there is any profit margin left out from production and regulatory costs to the sticker price, you can believe someone, somewhere will make whatever you are talking about.
Now, is there a better return on automatics using the latest plastic and CNC machining technology? Oh yeah. But, this doesn't matter one bit as to will revolvers be manufactured? All that matters is enough people purchase the weapon to make it feasible.
Now, there is alot to be said about fit, finish, and material cost. All are important reasons that the revolver is more, but no one can discount any of the factors and make them less than what they are.