By Daniel Kline Caesars CEO shared some big news that should make the cruise lines (and their shareholders) happy. Las Vegas and the cruise industry have an overlapping customer base. Many of the people who visit Sin City and a lot of the folks who take cruises like to gamble. That’s likely why Caesars Entertainment (CZR) – Get Caesars Entertainment Inc. Report often has promotions where guests who have hit some of the higher tiers of their loyalty program can get a free Norwegian Cruise Line (NCLH) – Get Norwegian Cruise Line Holdings Ltd. Report cruise simply for staying in Las Vegas for a f…