Despite being pilloried by the public lately a banker’s lot can’t be all that bad. At least that’s what Wal-Mart executives must be thinking. Over recent months there has been a flurry of announcements from the world’s largest retailer about the expanding array of banking products sold at its U.S. stores. Company officials insist that their main aim is to reach the ”unbanked” and ”underbanked” with the type of low-cost services that cemented Wal-Mart’s reputation as a retail giant. So do traditional retail banks on Main Street USA have reason to worry?