As traditional Wall Street moneymakers like stock and bond trading suffer, banks are growing increasingly willing to invest in less glamorous operations: their credit card businesses. JPMorgan Chase & Co, (JPM.N) Citigroup Inc (C.N) and other big banks are making more credit card loans, after years of focusing mainly on customers who paid off their balances each month. Lenders hope that in an era when consumers are conducting more of their banking online and less in branches, an increased emphasis on credit cards will help them sell more products to their customers.