Sites don't give you info up front
If web sites were to give international shipping costs up front it might be useful. Too many times, I have had to go through a registration process and enter all my details before I can even find out what the shipping cost is to the UK, or even if they ship to the UK anyway. I then see that they don't or it's not cost effective for me to order, so I just give up. But now they have my details I will then end up on a mailing list getting regular emails about a company I can't or don't choose to business with. Basically, too much hassle.