"Shopping local" is a popular phrase amongst Etsians. I even had someone tell me they chose to buy from me because all the other cases she liked were from other countries.
Also, there is that whole "American Pride" thing.
"Made in America means you are supporting OUR country. Go America GO!"
That being said, AT LEAST 50% of my sales are international. Also, I personally wouldn't let the fact that the item was made in another country be a deciding factor in an item that I buy. (Unless, of course, the shipping was outrageously high).