Why LZ keyboard are so damn expensive?
Well, firstly, the cost of manufacturing and materials is going to run a couple hundred dollars at the very least.
You need to understand that with such a low number of produced boards that the cost of manufacturing will be inflated quite a bit.
The next thing you need to consider is that LZ wants something out of his work.
He isn't just going to give up his hard work at zero profit; he spends quite a lot of time designing these boards and organizing buys.
Finally, his boards cost so much because people will still buy them at that price. This attitude isn't exclusive to keyboards; just look at any collector's hobby.
$400 is pretty cheap for collectors, all things considered.