I researched Zume quite deeply for interviewing with them and I never could figure out how they intended to make money. They had a vast plan that was way to big to execute all at once and none of it was ever going to be complete. I got the sense that they had received way too much funding and had gone on a feature-creep binge as a result. I learned a neat lesson from that: you can kill a startup with too much money up front.