Costco's strong quarter shows shoppers can't get enough of the wholesale club

Costco beat expectations for its fiscal first-quarter earnings, with net sales growth of 7.5%.Comparable sales growth was largely driven by increased traffic.The company ended the quarter with nearly 139 million membership cardholders, up 7.2% over last year.People just can't get enough of Costco — even as membership fees went up.Advertisement The wholesale club beat Wall Street's expectations Thursday, posting fiscal first-quarter net sales of $60.99 billion, up 7.5% from the same period last year.Compara ...