FINRA will hold off on raising fees for its member firms despite "revenue challenges," according to an unusual glimpse the regulator gave into its projected 2018 budget.  Projected revenue of $822 million for 2018 is relatively flat when compared to 2013, the last year that FINRA raised fees, the regulator says in its newly released budgetary summary.  FINRA derives about half of its total revenue from indu ...