They are not as simple to make as they look to make.
Depending on your end goal, you choose the machining technology that makes the most sense. In this case, the backspring and the mating part of the blade are made with a wire EDM. This is one of the machines I have personal experience with and one of the most accurate. It removes some of the issues associated with normal milling technologies that impart stresses into the part that cause warp, twist, etc. The EDM is capable of taking the tolerances normally associated with CRK to another level. Sub .0001in
More or less, it's the properties of the technology used than the tolerances it's capable of and it isn't cheap.
It astounds me that people are capable of looking at any manufactured item and are instantly capable of telling what it should be worth based on the looks alone.
On another note, I did drop by the shop for a bit to pick up the Damasteel Inkosi today and had some time to talk to Tim Reeve about the Impinda.
He states that the UK laws are based on edge length, which the Impinda is at 2.95in.
Also, I will likely get an Impinda for a passaround out of the next batch.
Stay tuned.