I like that idea. The wealthy tithe more, so they get served first. That's not good, but you know why it's happening.Just introduce the historical concept of a tithe, and one of the benefits that the populace get in return is general healing and spiritual care.
Depending on how much power the churches have in your world the commoners would throw your extortion temple out as soon as a priest of a different faith who will do it cheaper comes around.
Or at least they will go to the temple who offers it the cheapest, because why only have one with so many gods around?
Collections: Practical Polytheism, Part II: Practice
Part II of a series at the underpinnings of ancient polytheistic (Greek, Roman, Mesopotamian, Norse, etc) religious practice.acoup.blog