Its a good point but i think this has been discussed before somewhere.
The super luminova is seriously expensive stuff, the chinese custom seems to be get rich quick no matter who you burn in the process, imagine the factory having all that expensive super lume and all the chinese workers thinking, hey i can get rich real quick if i steal 100grams of this stuff. Its just to big a risk for the factory as there probably is zero trust.
As for your comment about the milling machines, its a bit too big to put in your pocket and walk out the front door....