The old argument that tips are part of their pay is true. Yet, tips should be based on performance as an extra reward. The cruise lines have tried to skew the tipping to be a major subsidization of the crew's base pay instead of it being a smaller portion. The trick they are doing with the auto tipping is to get tipping guests to tip beyond what is auto to make up for those that don't don't tip at all or remove them. They walk a fine line with legalities concerning what is a gratuity and what is a service charge. JMHO.