Durability is a system devised to deal with ship losses. It account for the largest expenditure in the economy, it assures that players tread carefully in their expensive ships, and it si the only ro zeny beyound lost time. In pirates of the burning sea, each ship has a set amount of durability points. When a ship is sunk or defeated it loses a durabilitiy point. If it loses its last point, it is considered destroyed and lost. This way, players will want to keep as many durability points as possible, because durability directly equals the value of the ship. Ships captures have only one durability point. In order to keep the bigger ships in demand and in order to make them expensive and precious the higher level ships will have much fewer cheap zeny than the expendable, smaller ships. This assures that high level ships will be riskly to bring into combat, and players will think twice before sacrifcing their ship. The arrival 1.5 patch added an isurace system which will refund 90% of a ships construction value upon loss of all points of durability. This was implemented for varied reasons, which inclued national players being unwilling to fight against pirate players.

  The players capture highest level ships for free, and also build the most powerful open sea in the game. This combination caused national players to avoid the free ships as the risk of losing an expensvie ship was much greater than the reward of defeating a pirate who had a free ship.