As you have just started selling the app, don't be too quick to judge it's popularity since it might take some time to gain awareness.
Your app certainly looks great. We do hope you will succeed because it will also give a lot of corona developers here some hope that a well-made app does have potential to success. Of course, much will depend on marketing as well.
We will also be launching our app soon so we will check back with you again on what we did on our end. Have a great and successful 2012!! *Thumbs up!!* ??!!