Secondary market gains and earnings on mortgages in pipeline played a huge role in the significant jump in mortgage banking income during 2003, according to a new report from the Mortgage Bankers Association. The MBA’s annual cost study showed average pre-tax net financial income climbed from $40.4 million per lender in 2002 to $60.7 million last year, an increase of 50.2 percent. “As in the previous two years, favorable warehousing interest spread and secondary marketing…