With a lot of high end speakers, you're also paying for well crafted furniture. Anything designed to both sound great and look great takes a lot of talent. Great engineers, designers, craftsmen, and most of all, discerning ears all come at a price. The cost of building to precision specs, quality control, and transportation don't come cheap either.
So you can't just consider the cost of reproducing a design as the total cost of a product. There's a lot of IP and raw talent that goes into the final price.
Dealer markups double or triple the price, which is why I usually buy used. But if something is desirable, it's what's the market will bare.

