Wal-Mart's cost too high for workers, merchants By BILL DANIO and SUNG SOO KIM With more than 3,000 stores and super centers in the country and more than 1.5 million employees worldwide, there is no denying that Wal-Mart, which wants to build a 135,000-square-foot store in Rego Park, Queens, is a Wall Street darling and a rip-roaring success story. More and more, however, people are beginning to see that Wal-Mart's incredible expansion is only one side of a more complicated story. The other side of the narrative finds Main Street shopping areas closed all over the country. It finds regional...