Cruise lines can boost sales if they define luxury and understand what their customers expect from a luxury cruise. That was the sentiment echoed at the Luxury Travel Exchange International's general session this week in Las Vegas. "People like to buy things from people who know more than they do about the product," said Rick Sasso, president and CEO of MSC Cruises. "Familiarize yourself so that it makes it impossible for someone to say 'I'm not sure.' Hone your selling skills and product knowledge and increase your sales."