Back to my question, if you go by that logic where do you set the threshold and to your point....what basis do you use for the scale?
That's the right question.
Personally? I enjoy lower power levels.
Let's say using MKM average price, anything 40€/50€+ must go (using the lowest printed value).
Maybe ban a few cheese 97-98 lands+2-3 cards combo decks while we're at it, those decks makes no f*cking sense in the format.
Imo, to
simplify things a bit, the format could use a set limit on decks total value (without basic lands) and have different "levels" based on value to keep things fair and balanced.
0->150€ max 30€/card "entry level" (will work with most precons and lightly upgraded precons),
150->350€ max 70€/card "advanced level" (now you start to invest a bit more in the deck while not going overboard),
300€+ cEDH no max/card, man if you're going to spend that much for cardboard that's on you (dual lands, the heavy stuff...).
That's pretty much the "rule 0 talks" at this point.