I'm betting that you could get this ship for less than the $150M asking price, say $125M?
Then, there is the issue of docking fees, crew and fuel. Maybe buying a boat (any boat) is not a good idea!
Funny story, a friend of mine had relatives that "gave a boat" to him and his wife. First trip out, it started sinking going through some locks here in Washington tate. Fortunately, he had purchased insurance!