Maybe I'm stating the bleeding obvious but don't forget to factor in currency exchange. Although I'm not sure of the current rate I'm pretty sure that there is still import duty on second hand boats plus you will have to pay GST. GST on imported goods is based on landed cost not purchase price. A large part of shipping costs are tied up in land based charges at both ends.
“Give a man a fire and he's warm for a day, but set fire to him and he's warm for the rest of his life.” Terry Pratchett