The difference is that scalping is about buying enough of a product to actively deny others said product so you can sell them at a high price to them. You WANT people to not be able to buy the product, so they can buy from you. If they're happy, you're angry that they're happy.
These sellers are buying them to sell at a higher price in a different country. They're not trying to deny the product to anyone, they just want to sell it to those who would rather not have to come all the way to the US to buy one, or go through the risks (and higher prices) of online shopping. Hell, opposite of scalpers, they might get a better deal buying these items from these sellers than importing them.
Note, scalpers SUCK, but I would still defend your right to do whatever they want with the product you buy. It is after all, YOUR product.