By Daniel Kline Your cruise just got a little more expensive. Cruise line workers work very hard for, in many cases, relatively low wages because the major cruise lines operating from the United States do not flag their ships here. That means that Royal Caribbean (RCL) – Get Royal Caribbean Group Report, Carnival Cruise Lines (CCL) – Get Carnival Corporation Report, and Norwegian Cruise Line (NCLH) – Get Norwegian Cruise Line Holdings Ltd. Report do not abide by American labor laws. And while cruise lines have many workers that passengers never see — the people who make the ship run — they a…