I hate to look a gift horse in the mouth, but I'm wondering why so many apps are free. Take for example, PandaHome. I installed it and really love using it. But in the back of my mind I'm wondering why this product is free. Part of my concern is PandaHome has access to many key parts of my Android phone, like contacts, etc. Is it somehow tracking / using my data or my use of the phone for some other marketing purposes? They say there's no such thing as a free lunch, so there's got to be a catch somewhere? Why are so many great apps free?