When it comes to purchasing prime interest-only loans, Freddie Mac clearly has a healthier appetite than rival Fannie Mae, according to a new analysis and ranking based on the Inside Mortgage Finance MBS Database. All together, lenders sold $40.86 billion in new IO loans to the two government-sponsored enterprises during the first three months of the year. Putting that figure into perspective, the two GSEs combined purchased just $86.21 billion in prime IO loans in… [One data table included]