Costco is already reaping the benefits after recently introducing membership card scanners at the front of warehouses in its U.S. stores, and the move is being well-received by customers, the wholesale club said Friday. During the retailer's fourth quarter earnings call, Costco CEO Ron Vachris noted that the company has used card readers at the front of its stores in Europe for more than two years now and has been piloting the system in the U.S. for roughly six months. Ticker Security Last Change Change % C ...