As a developer, if Apple's fees went away, would you drop your price or just make more profit? Prices may have been pushed up but there is little incentive for them to ever come down.
There would be more room to drop your prices, not saying that people necessarily will. And if they don't, the extra profit goes to developers of the app you are purchasing, rather than the (second?) largest company in the world.
As I recall, there are examples of things you can purchase both on and off the App Store, and the prices are indeed different. Though that may have more to do with the off-store purchase going directly to the seller and not another app store equivalent.