well an evil strategy I wouldn't rule out is to make sure that you have loads of links in your system - you now own these links- then after a while insert an ad

well an evil strategy I wouldn't rule out is to make sure that you have loads of links in your system - you now own these links- then after a while insert an advertised page into the flow after a user clicks on one of the links. wouldn't be surprised if some of the shorteners start doing this at some point.