To me a scalper is someone who goes to the store on release day and buys the store out. Then he goes to the next store and does it again. He forces those who just want one to have to pay double the price. This scalper drives price up by controlling availability. A$$h*13. You can spot him when his eBay auction states quantity of 8 available.
The guy who buys two and later on sells the second at a premium because the item is not available anymore, but is still highly demanded by collectors, is just savvy. He has made an investment. I don't see anything wrong with that.
eBay flippers can burn in hell.