Sure getting featured helps, just like if a fashion designer has a celebrity photographed in their clothes, they will probably see a temporary bump in sales.
Getting featured on the App Store is one time, possibly incredibly beneficial, event, but it is not a marketing plan.
Ask developers how much difference being made a featured app makes to sales. Apple recently radically redesigned the App Store so that it could more effectively promote apps.
[1] https://techcrunch.com/2017/10/24/apples-app-of-the-day-feat...