I have to disagree with the notion that manufacturers shouldn't service grey market goods. The manufacturers make the product and ship it to either one of their own distributors or dealers. If a distributor or dealer then turns around, and against their agreement with the manufacturer, sells it in a manner they were not supposed to, thus creating a grey market product, the manufacturer should take it up with that dealer or distributor. With serial number tracking, they should know exactly which distributor or dealer created the problem and if they have a beef, take it out on the distributor or dealer, not on an innocent purchaser down the line with no knowledge of the problem.