Probably most of there losses are explained by markets they are trying to develop and also expansion into areas where they do not yet have drivers. I can't imagine the cost would increase too much going forward - it's essentially the same as the cost of delivering pizza, and pizza isn't too expensive, and riders can pool, so it should be below the cost of pizza to deliver a person. And once people start giving up cars for Ubering, pooling will become much more efficient.