Las Vegas, NV - February 4, 2013 - (RealEstateRama) -- Why is Fannie Mae countering short sale offers so high above market value? For the past few months, short sales with Fannie Mae as the investor are being countered by banks 20 to 30 percent (average) above fair market value. Is this the banks fault? Not necessarily. Banks servicing short sale files with Fannie Mae as the investor must follow the guidelines set forth by Fannie Mae.