The look is just an added bonus; the bow design ensures a much smoother ride in poor weather conditions - rather than riding the wave (and, potentially earning the vessel the nickname 'The Vomit Comet'), it cuts through the wave (reducing vessel heave) and even (drumroll) effectively disperses the waves as they traverse along the hull, reducing drag.

So - better ride, less fuel consumption, cartoonish look. Win-win-win.