Because the current owners of the ship (Urban Commons) is most likely diving into bankruptcy. They owe the city hundreds of thousands in unpaid taxes, not only with the Queen Mary but other places they own (Including places in Orlando). Though admittedly, it's a good thing UC is most likely on the way out since they were terrible owners. They just didn't take care of the ship, they'd rather spend money on pretty much anything else...some of which ironically had to be short-lived because of maintenance issues on the ship.