While this can help the seller can so radically change the listing that it doesn't always stop review hijacking. As I understand it they sell something simple and cheap then repurpose the listing for something else entirely.
Strange that something like this is possible, I've always believed that the likes of amazon/ebay had better fraud detection. changing listings seems like an obvious door to fraudulent behaviour. Being able to track packets around the world nowadays should also help detect fake customers for the sake of reviews. (Since the quantity of legit adresses is better known than the quantity of shady adresses.
