You apparently haven't watched a lot of tv lately , Ditech and several of the other net loan companies , along with a number of B&M banks are offering them , you can pay your principal or just the interest . They're pushing them heavily and the suckers that take them are frequently alsopushed to buy more house than they can actually afford by these same lenders .There are entire developments where Ilive filled with couples barely making their monthly interest payment because of this .