At that end of the market they cost an astronomical amount of money, no matter what.
The $140,000 device doesn’t become a $400 device in any volume; it might become a $90,000 device.
these prices are like airplanes: no one with volume pays list prices, it's something else. moreover, this FPGA is very peculiar. it's used to simulate ASIC during validation, so it's not really the typical FPGA that gets used in a project
No, I expect you could get it under $20K with not that much volume and potentially in the single digit thousands in high volume. The FPGA vendors' business models are weird, the price breaks are unlike what we see with most other parts.
Companies make products based around FPGAs and can sell the whole thing for less than you could buy just the single FPGA part for on a place like Digi-key. It's just part of the FPGA companies' business models. In volume the price will be far smaller.