I think for 30% of my revenue I'd expect reviewers to find the time to use the full context of the app. That may not be realistic for every app on the app store

I think for 30% of my revenue I'd expect reviewers to find the time to use the full context of the app. That may not be realistic for every app on the app store, but it is reasonable for apps with tens of thousands of reviews and hundreds of thousands (at least) in revenue.