The Mac App Store is deader than a dead zombie. Why would any developer pay Apple 30% when they can just have people buy a license from their website/store and keep all the money?
Because it offer app hosting and easy payment for the customer, as well as discoverability in a marketplace that come pre-installed with every Mac. The store is not as vibrant as it’s iOS counterpart, but I’ve personally discovered quite a a few good tools there that I otherwise wouldn’t have.