Retraining Captains and juggling them is more complicated and expensive. The cost of ports, waiting for ports to come on sale. Playing them reduces speed of my progression to higher tier ships, as spending time messing about having fun. I need to earn lots, playing tiers 4, 5, and 6 lots will do this. I can division with mates more effectively, especially new players. Having a selection of ships of different tiers has several benefits. I do not consider getting tier x a priority, though will always be grinding upwards in at least 2 lines. I am collecting a fleet of ships that will suit my moods and offer different play styles.