The 'advantages' of creamer as opposed to actual dairy are generally being lactose free (though they do contain casein), longer shelf life, and coming in a variety of flavorings. If you also include the powdered kind then you have the advantage of not even needing refrigeration after opening. I've seen many a waiting area or office where they have a can (or tub) of the powdered stuff offered up next to the cheap drip coffee being provided.