... and I should have addressed your primary concern:
I too cannot fathom the difference as it crosses the pond. I've shipped entire cars from england without the benefit of economies of scale or wholesale pricing, etc and it sure isn't $15k.
I guess what it truly reflects is free market economy,
"I've got this, I want this much for it; too much for you? fine, don't buy it" attitude.
I wanted a Caterham bad enough to pay 30, but not bad enough to pay 60. Everyone's got their window of tolerance