why the hell are these so overpriced?!
Because ppl want to make money and don´t realize that bitcoin mining is no longer a get-rich-quick game.
These particular units use the probably cheapest 28nm chip available, the one from hashfast. (it is the cheapest one because bankrupt hashfast sells them below internal cost)
The PCBs need a bit more than usual mining pcbs, and the watercooled system adds a little to pricing.
However, internal costs of these miners shouldn´t exceed 0.6$/GH, so there is a massive margin.