I worked at NCL and had a friend who was a casino cashier. I believe it is one the lowest paid positions in the casino. My friend hated it after 3 days and after 3 months (once she had saved enough money for the ticket plus some more) she was gone. Of course it was her first time working on a cruise ship.
She didn't like the shifts and she had to share a room with 3 more people.
It's up to you but I think you could find better paid positions