TBF Im not sure that the pirate debris was ever intended as an income? Could be wrong, when we all first started doing expos pirates and aliens were a hindrance. Im sure they didnt plan for people to build millions of LC and LF to abuse it. its stripped right back to cargos and pot luck.
It was definetly their intention to make pirate debris an income, otherwise they wouldnt have made the pathfinder. However, I do agree that they probably didnt intended it to give billions of profits.