That's called "spiritual coaching," and yes, it is an actual practice. Since it is consultancy work, there is usually a fee for services (sorry SnowCat, lol), though in some instances they'll work pro-bono, for example if a child is endangered and the parent or other concerned party is trying to seek protection for the child.
But, that's just an example. A pro-bono arrangement for spiritual coaching services, or any other services for that matter, should never be viewed as an entitlement by a client, that's a mistake. Just as with services provided in any other industry (lawyers, etc.), it should be respected as a decision made at the sole discretion of the practitioner, along the lines of...
I see nothing wrong with charging for supplies used and a reasonable fee or trade for time invested, and limiting visits or even refusing chronic clients. [But] If I want to freely give from my heart to a need, I'm all for that too.
.