To OP, there are many more ways to make money than this, much more profitable too, hell, one ore run is probably the equivalent of killing 1000 NPCs or something (snubs obv).
If you really want to make money killing NPCs, get a large transport (suggest Behemoth, Border Worlds Transport, Pirate Transport, Gallic Assault Trans). Fit full Charons and a Train CD, then pop NPC transport vessels that are carrying valuable cargo (near NY - H-Fuel, Deuterium, Tobacco, Hydrocarbons, Synth Gel - those are just from the top of my head).
Popping NPC transports is as profitable, if not more so, than mining/hauling ore/squeaky gas.