When entertaining or just making a drink, a wet bar is a handy work center. It is a place for everything from glasses to ice, drinks to mixers, and most contain soft drinks and chocolate milk. By definition a wet bar includes a sink-useful when the party is over. In addition to an icemaker, we have included wine coolers, refrigerators, and drawer style dishwashers to take care of the dirty glasses.
I would say a wet bar is not an absolute necessity, but what a great accessory to a home where entertaining is a part of life.