Earlier quoted context omitted.
Or the CPU. But we're talking an $1800 machine with a 5400rpm disc and 8gb of Ram. That's one hell of a screen and CPU.
It's probably no longer true, but when the 5K iMac came out it was the cheapest way to get a 5K screen. You got the computer for free, essentially.
The high DPI monitor market is practically dead (for now) so there's no pressure forcing prices down.