Because they were produced in Germany for one, labor is treated well there.

The other big reason is too much demand from designers and vendors for one manufacturer: GMK.

GMK won’t say no to a customer’s order, they just put it in the queue. So something that takes over two years to deliver is not being worked on all those two years, most of that time is just waiting in the queue for earlier orders to be finished. If designers and vendors went with other manufacturers and GMK queue was clear then a GMK run could be done in a few months, which was possible back in 2015-17.

GMK has invested in more molding machines and new robotic sorting, so queue times and fulfillment times overall from GMK should decrease. As long as demand doesn’t increase to meet new production capacity …