I'm A Banana
Potassium-Rich
There's something coming up with me talking about this more with Outsider, but some of the Essential Class Features that are "Ritual Effects" are great because they remove the $ aspect completely.
Tying Rituals to GP was as narmed as 3e tying magic item crafting to XP. It's the same general class of issue: Why spend this resource we only get a limited amount of, ever, and never, ever recharge, on something we can do for free, without spending it?
I've replaced a GP cost with a "healing surge" cost, which is something of a stop-gap.
I'd love to see a "power surge" mechanic for these long-term effects to be measured...