But with the recent case of Costco and Omega watches. The court sided with the watch maker and saying basically its illegal to import grey market items and sell at a lower price than their official imported item. I am sure it will continue through the court system somehow. But basically for now at least one manufacturer has won against grey market importation! The Supreme Court voted 4-4 over it so the lower courts ruling stood with no decision from the Supreme Court (Kagen recused herself from the case, but it was said she would have voted for Omega). Omega has the right to control the pricing of their products in the US, basically stopping grey market reselling! They won this because they put a copyright on each watch.
Now if the camera makers follow suit. Who knows!