[jitendrac]

Costco launching/selling products with own sales data is one thing.

To make it clear, Here you should consider Amazon.com different entity than Amazon Seller Account. Now would you sell on amazon.com if amazon.com leaks your data to "amazon seller account" owner to boost his sales of a similar product, which you sell.

Moral thing is, Amazon seller division who deals with product directly sold by Amazon, should never have access to the data of other sellers.Fullstop.