Thank you for the question.
Yes, the ongoing cost of refitting old ships is expensive. There's no doubt. They are harder to refit and harder to get parts for. You find more metal fatigue and you find problems you had not anticipated when you open up a ship like that for a refit.
It becomes a question of what you lose if you don't do it. There's a capacity loss that has to be weighed against the investment made. Buying new, though, is a long process. That's the concern.