When developing an iOS app one should consider that a good looking and intuitive design is a major factor for app success. The easier and the more comfortable the app is - the more people would be willing to interact with it. A great design is simple yet elegant and functional. We know perfectly well that iOS users really appreciate a good design and that "special" feel of the application.
That is why we don't just simulate the feel of your web application on iOS Device - we make it feel native. Users always feel the difference.