I'm on the opposite end of spectrum here...If you are figuring in all of your expenses to make the product (including shipping) X2 for wholesale, X3 or 4 for retail you are in fact gigging your customers X2 and so on for your shipping, then charging them for their own shipping on top of it. I simply tack on another 10% to their orders shipping cost, which ends up being a couple of extra bucks that the customer doesn't even see...All works out.