I've been shopping for a used computer and have noticed a disturbing trend of "Lockerz.com" invites being listed on ebay as if they were actual laptops or ipads. The auctions have all the pictures and product specs, some even offer "free shipping" and then at the bottom the seller admits that they are just selling an "invitation" to a website called Lockerz.com where products like laptops can supposedly be earned by viewing advertisements. I'm also quite certain that Lockerz has actively manipulated their Google positioning so that searches return articles that assure users that the site is legit. Google "Is Lockerz a scam" and you'll see what I mean.
Regardless of whether anyone ever actually earns prizes on Lockerz I consider listing like the one I've linked to to be fraudulent and have started reporting them to ebay whenever I encounter them.