Sniipe, for what it's worth, this is in the "Our Payment Policy" section when you click on "Shipping & Returns":
Our product description pages show the weight of each product. This is NOT the actual shipping weight. This "weight" is used by us to calculate the shipping charge. It is not the weight of the item. Many times we set weight so that we have a fair shipping charge which includes packing materials, boxes, etc. We will make every attempt to NOT overcharge on shipping.
So, if you feel you were overcharged (as some certainly do in this thread), complain about that. If you bring up the difference between the two numbers, they'll just point to their policy.