BMLA are just stolen Detroit guns, just like Side Arms are looted Daumann and Enfer is stolen Gallic toys. Kemwer and Volgograd are homegrown equipment being quietly moved to revolutionaries across Sirius... and there already exists a NPC base selling those exact goods in the general area, which would just exist to arbitrarily inflate the cost for "balance". The whole point is "proto dump for unloved POB module", not "hmm yes I want to make multiple trips on my Order 5ker today".
The big bottleneck is prototype components. The recipes, as written, will eat an entire day's production worth of prototype components in a little under two hours. If someone has, say, 100k protos just lying around and wants to burn them all at once in a POB of a very specific IFF to make a shitload of money, that is very much a one-time thing.