Return-on-equity goals set by Fannie Mae and Freddie Mac may be inflating mortgage securities guarantee fees – and ultimately hurting the profitability of mortgage bankers. That’s the conclusion of a study released last week by Jay Brinkmann, vice president of research and economics for the Mortgage Bankers Association, which suggests that Fannie and Freddie have been able to use their unique market position to keep so-called G fees high. …