Do you think they're only using this for groceries and that it will never be expanded to other retail? In the article it says they are already in talks with other vendors. This means your hand does more than just buy groceries, it will work anywhere there is a palm scanning terminal. It will work at WalMart or Best Buy to buy thousands of dollars of electronics, or maybe even one day to buy a car. Maybe your phone will even be able to read palm prints, and you can buy and sell private goods, or illegal goods using it. That's a lot more than a bunch of groceries.