Is it difficult to design an app that focuses on sharing files with others? Not just notifications, but small files, anywhere from the size of a photo, to a small audio file? Does apple have restrictions on apps that send files or on the size of the files? Also, Ive seen people offering anywhere from $10-30k for developers to make gaming apps. Is it cheaper to hire a developer to work on a non-game app, that doesn't require any serious graphics & level-design, just a solid interface and some social networking features? While I know this is a wide range of apps, does anyone have an idea on what costs range for these types of non-game apps?
Actually your idea sounds more expansive, than a basic game because of the probably needed server side infrastructure.
