No pretension to educate you here... But can you give 3 big companies making hardware and using open source? emphasis on big and hardware
Some big companies like Microsoft are using open source to achieve product dissemination and in return we get free compilers.
2 successful example are Adafruit (33million Rev in 2014) and Spark Fun but both don't make real products but devkit for enthusiasm young and old
We live in a world where a hardware company valuation is in relation to it's IP ( intellectual property) portfolio. No IP no Money...
This is the fundamental, It's not to say that Pimax can't go open source but
you have to start from there. And should we note you're only speaking of open source for the firmware