The funny part is that their estimated cost per pound is based on membership fees paid to WW while losing weight, not on the cost of the food eaten during the weight loss process. Nutrisystem and Jenny Craig may be a bit different since you have to buy their food on the plan as well as pay membership fees.
So...assuming that you spend 8 bucks on the paperback version of Dr. Atkins' book, that comes out to....10.6 cents per pound so far. WOW!