Reuters: Nearly 20 percent of Apple Watch buyers are not only shelling out hundreds of dollars for the timepiece but are springing for a spare band too, giving the tech giant a profitable second dip into customers’ wallets. The ever-secretive company is estimated to have sold 2.79 million units of the watch as of mid-June. But if the band purchases are any indication, sales of the watch itself are just the beginning of Apple’s profits.