Call me a bleeding heart, but most of these ship workers seem like such lovely people with big hearts, who work in difficult conditions for supposedly not such great wages...many of them speak of sending their money home to help support their loved ones...I can't imagine not supplementing their incomes with some additional tips. No, it's not required, and I don't expect everyone to feel the way I do, but if I can afford a suite, I can afford to tip those who positively enhance my vacation experience.