水貨客 in HK = Resell and make money
Canadian @ US Costco = A real shopper who is looking for cheaper price
水貨客 in HK = messing up the whole damn city in HK, the whole city has milk shortages
Canadian @ US Costco = only affecting a few towns in US, US still has milk to sell.
Yes, this is just my point. I don't think people in Bellingham will have milk shortages problem. They just don't like to see so many Canadian shopping at their town.
But in HK situation, you can't find a can of milk for their hungry babies. If you are a parent, you will understand how important to have enough milk at home all the time.
As a Canadian myself, I know I would not do the same to hurt our American neighbour. It only save a few bucks to buy milk and it took a lot of effort to drive and cross the border, plus, I don't think my fridge is big enough to store 5, 6 big carton of milk...