Still requires a decent app to be featured, and furthermore, to back up the feature. I don't think it's fair to caveat every app store success story with a comment about being featured.
If you look at the chart, you'll notice the 3rd feature didn't affect our sales much at all. We've pushed out 12 major feature updates since launch and I believe that had an impact on our sales as people can feel confident that we stand by our product.