Paying $10/yr for a domain is well worth the cost just to be free of attaching your entire digital life to a gmail etc account that can be easily taken from you with no recourse.

But beyond that self hosting is a hobby. It’s not nearly turnkey or cheap enough to justify unless you enjoy the process of self hosting itself.

There are other benefits outside the monetary equation of course like control of which the value is dependent on the self-hoster.