I do see that you have a notice saying to contact you first for shipping.
However, this method is not always reliable and many buyers don't bother reading full descriptions.
You do charge .01 for shipping in your shipping terms and this is what the buyer will home in on and take advantage of.
When you create a listing, there is a shipping option 'Not Known' which you should use, if you don't have the time to calculate shipping costs to all the countries you ship to.
Hope this helps.