The goings on at the port will have an impact on the price, and that's what the traders care about.
Lets say there's some problem at a port (bad weather, labor strike, whatever) that causes delays in the delivery of (other people's) oil, traders are still going to be interested because it will push up the price, even though if they're not taking delivery from that particular ship.
Lets say there's some problem at a port (bad weather, labor strike, whatever) that causes delays in the delivery of (other people's) oil, traders are still going to be interested because it will push up the price, even though if they're not taking delivery from that particular ship.