I just tried to find a screen that's comparable to the iMac (resolution 5210 x 2880 and wide gamut colour space), and those I did find actually were around $2000 (i. e. http://amzn.to/2iPC5SZ).
I also believe the price difference is magnified by the options you chose – Apple does indeed charge too much for additions like RAM. The base model, with the same 5k screen, only costs $2000.
All that's neither here nor there – if I'm spending 10h+/day with something, I'm not going to look too hard at the price. Just the difference in noise is worth a significant premium, not to mention macOS.
I also believe the price difference is magnified by the options you chose – Apple does indeed charge too much for additions like RAM. The base model, with the same 5k screen, only costs $2000.
All that's neither here nor there – if I'm spending 10h+/day with something, I'm not going to look too hard at the price. Just the difference in noise is worth a significant premium, not to mention macOS.
Edited: macOS :)