It would be helpful and highly beneficial to be able to fast-travel to the traders. This would have several effects: 1) A fee of 5 Dukes per meter could be charged (10m = 50 Dukes / 1000m = 5000 Dukes). 2) The landing pads at the traders' locations would serve an indirect purpose. 3) This would keep Dukes useful, especially in the endgame. 4) It might also be possible to build something at your own base to travel to the traders and back (perhaps at a 50% higher cost). 5) You might first need to hand over specific resources to the traders to "build" the landing pad and the helicopter. This would also further enhance the endgame experience.