The number of views can be a good starting point to make an estimation. A typical value for an average app would be 10.
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Custom gestures, custom buttons, and custom transitions will cost you — it's not cheap being pretty.
A profile means that some of the people that use your app will have to enter information about themselves that might be viewed publicly.
This means you'll need to make an API (or Application Programming Interface.) It's how all your friendly apps talk to each other.
Does your app need to connect with your website?
Do you need an app icon?
Designing a quality app icon typically ranges from 850 euro but will help you stand out in the app store and on the device.