Although mortgage bankers are enjoying their strongest profit margins in years, smaller nonbank shops continue to live in fear that Fannie Mae and Freddie Mac – under the auspices of their regulator – may soon unveil higher net-worth minimums. Officially, the net-worth minimum is set at $2.5 million for both government-sponsored enterprises, although Fannie Mae has imposed volume limits on some newly approved seller/servicers that have posted big increases in their sales to the GSE. Several industry executives and their outside advisors fully expect...