Out of all your examples, only Ghost is self hosted. Not everyone wants to or is able to afford a $20/month provider, especially small businesses outside the US.
Given that your previous comment said "can be jump started by anyone", self-hosted is definitely not a reasonable requirement.
Self-hosted WP cannot be jump started by anyone, and in the limited cases it can (very, very limited WP), you're probably not spending much less than $20/m.
