I'm all for making missions harder, but I'm not for making them give less rewards.
I would like to remind people that much of the Ore hauling stuff had Karsts involvement. Make your ore system more profitable or more worthwhile, maybe make the routes shorter, or maybe turn your eyes to the regular trade and make trade routes that arent just "Pick up this cargo from <anywhere> and haul it to <anywhere> for the same exact credits per second"