#distribution
Mac App Store vs selling your Mac app directly
The Mac App Store takes a commission on each sale (15% for small developers) and handles everything; selling directly costs a merchant-of-record fee instead, and you keep the customer relationship and your own licensing.
Do you need to notarize a Mac app you sell yourself?
Yes — an app you distribute outside the Mac App Store should be signed with a Developer ID certificate and notarized by Apple, so Gatekeeper lets people open it without a warning.