I'm curious about the Mac App Store argument. If you already built an iOS app and got it through the app review process to sell on the App Store, why would you

I'm curious about the Mac App Store argument. If you already built an iOS app and got it through the app review process to sell on the App Store, why would you make a Mac port and not want or be able to get it in the Mac App Store? The iOS restrictions are much tougher than the Mac as far as app review goes. And you already willingly accepted selling through Apple for iOS.