A: In short, there's no recipe. Featured themes are selected by Oxwall Store editors on their sole discretion. Our main goal is to show the best themes to the community first, but of course this “best” thing is pretty subjective.
When selecting a theme to be featured, we try not to pay attention to its price. But we come from the open source world, so admittedly we have a little bias against pricy items. But again, quality is first, of course.
The only recommendation we have for you is to make your work stand out by its quality. There's really no other way to be featured on the front page of the Oxwall Store.