That's BS because they don't give you the option to host it yourself and avoid the fee, plus it costs them nearly nothing. $30 million/year dollars might seem like a lot until you realize Apple makes over $70 BILLION/year from app store revenues alone.

Also, what traffic? Organic traffic on app stores has always been terrible. In most cases, you can't even find an app by searching for it directly unless it's well-known like Netflix or Amazon. Even developers who have been "featured" over the years have reported a huge spike in traffic followed by an immediate fall-off and return to the same traffic numbers before the feature.