Don't forget this:
The materials manufacturer gets a cut.
The component manufacturers get a cut.
The frame manufacturer gets a cut.
The bicycle company gets a cut.
The distributors get a cut.
The shipping company gets a little piece.
The bike store gets a cut.
The pie is getting sliced pretty thin right there.
There are bikes and there are bikes. Why does a Mercedes cost more than a Hyundai? They are both cars?
There is some premium being paid for the brand name. However, there is extra quality in there too. The honest truth is that in road bikes, the average serious recreational roadie is riding the automotive equivalent of a middle of the pack, or better, formula 1 car. We are, for the most part, riding full blown professional level equipment. Try that with your car and see how much it costs.