Why would the manufacturer bother instead of just telling you to not buy on Amazon and buy directly from them? On any expensive item that people research it seems like it'd be in their interest if Amazon got a reputation for selling fakes, to break the habit of people who only look on there.
Only if Amazon got that reputation in the broader market. Otherwise, manufacturers would potentially benefit from retailers having a more difficult time claiming ignorance about which items in their warehouses are fake.
