Someone on this forum said that as your nightly rate goes down, air service fee percentage goes up, hence the low-ball pricing advice from smart pricing. I wish I could find that thread.
I did not realize that airbnb can charge guests as much as 20% of the nightly rate for their service fee. Wow!
Edit: Here is that thread.
https://airhostsforum.com/t/airbnb-service-fees