If I put offer Worldwide FREE shipping, how do you deal with the countries that seller charge shipping fee? For example, a product cost USD40 in Aliexpress, the shipping fee is free by e-packet to few countries only. Whereas other countries, the shipping fee varies from few bucks to USD40+. How am I going to make a profit if I am selling the product for USD80 and someone places an order from a country where seller charge USD40 for shipping fee? Any suggestion? Thanks.