
If you haven't tried Nividium mining yet, there are many hurdles to overcome to do it properly and make money. Make nice with NMMC, and you're halfway there.
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Have you tried the other illegal goods like Pirate Side Arms or Ion Mines?
In FL, enemy traders will still buy from your station if you have their faction set to 'friend' in the station's control panel. This allows their ships to dock. I suspect they will also sell goods, but I've never verified. You actually get reputation boosts from trading with enemy ships. I have a weapons complex in Goner space and routinely gain recognition levels with enemy corporations as their traders buy from my complex.
Would this affect their hostiles rank? Let's say Paranides buy goods from your complex and that increases your rank with them. Will it also affect you rank with OTAS?
Possibly, because it's a slow process it might not be obvious. In AP I gained Terran rep despite them being red to me by allowing them to dock at the Xenon hub to trade by adding every ware to the list. It let me boost my rep enough for them to offer me missions in their sectors which did the rest.
I suspect it does as it would probably behave like any other reputation change in the game, but I have never checked for sure. You only get a tiny boost per trade so you really only notice it for factions who are near neutral where there is a small point spread between ranks.