Hidesato: "My Lord! We are now able to upgrade our Pirate's Den and our Warehourse!"
Motonari: "The upgrade of Pirate's Den is useful in Bingo as we want to get the best advanced ships. How about Warehouse?"
Hidesato: "It upgrades to Red Seal company and... a 1% reduction in trade tariff from 6% to 5%. What the... somebody made a mistake?"
Motonari: "We are not using the port in Hizen to trade anyway, so there is little difference. But why would anybody pay to get a reduction in income? The Red Seal trade ships do not even bring back more trade goods..."



Note: The Red Seal trade ships have more crew on board, so one does not need to protect the trade fleets anymore. But we could always use 1 Bow Kobaya to protect them and wait for the real fleet to dispatch the threat. Besides, at this late point in the game, all trade nodes should have been filled with full stacks of regular trade ships anyway, and the Wakos always leave a full stack of trade fleet alone. So there is really no point to replace them with Red Seal trade ships. Red Seal Company should go bankrupt.