RE: FM receiver
I think you have to appreciate that the cost of the components is only one part of the total cost of a receiver.
Huge amounts of money have to be spent in the design and testing stages of a receiver's development -- then there's tooling up for production, quality control, marketing, the retailer's margin and a whole lot more.
Of course the ultimate measure of whether a receiver is well priced or not is to ask yourself the questions:
1. Can you design, test and build one for less than it costs to buy one?
2. If your answer to 1 (above) is yes, then why don't you?
Even though I've got over 25 years of professional experience in analog and digital electronics behind me, I would not be able to design, test and build a modern RC receiver for less than it costs to buy one -- so I buy them and marvel at how cheap they are for the technology that's in them.