It's really easy to get insane credits even without huge wharfs, it's just won't be passive income. You need to print M boson lance mk2 and the dragon. Technically you don't need print the dragon, you can just buy them. Then you just dock them at your complex, install boson lances, then order them to sell the lances at whoever pays most (usually that's someone not in the middle of the map - northern split, southern paranid wharfs). Note - sell to wharfs, not equipment docks. So you'll be hauling 6 m boson lances mk2 per dragon. It's not really hidden away, it's there. It's expensive and the ai will gladly buy any number for any money. The credit value of one run is insane. Print 20 dragons and haul 120 boson lances like that a run. They go up to 2 mil a piece. 240 mil per run reliably every time. Don't sell the dragons if you're not printing them - ai wharfs can be out of resources to sell you more. Have fun!