You're being purposely disingenuous.
Second: many, many sites host their own DMG downloads, with zero fake download buttons. I don't think searching for an app's website on Google is significantly harder than searching for an app in the App Store (also I'm not sure typing in search terms is "one click", but whatever). I'll admit that using the App Store is slightly less work to install stuff, and somewhat more secure.
But from a user standpoint (I use a Mac with one or two App Store apps and dozens of DMG-installer-based apps) it's not a huge difference. And from a developer standpoint, that's not worth 30% of my revenue.