i've had a small (18' x 12' x 10.5) room with various speakers, including very dense heavy (500+ pounds) speakers of modest stature......WP3/2, WP5.1, WP6, all under $50k, then Kharma Exquisite 1D.....around $75k at that time.
the step from the Watt Puppies to the Kharma was big/huge/dramatic etc.....much more than just size.....more a matter of coherence and ease. size was not the major change.....it was refinement. smaller Kharma's would have got me part of the way, but the scale and command of the large robust cabinet mattered. it was as much speaker, maybe just a touch too much, for that room. which then caused me to want a bigger room.
and then a quite large room (29' x 21' x 11') with a number of ever increasing size speakers......Kharma Exquisite 1D, VR9SE, VR7SE, EA MM3, and finally EA MM7.
a large live room demands a lot from a speaker. and that speaker then requires a lot from the room too. the first three were around $100k + or -. maybe now equivalent to higher price......just over $100k. the MM7's around $200k 10 years ago, maybe more like $300k now.
no doubt the MM7's are the far better match for my room and are 'enough' to not be stressed by any musical demands. they have headroom in their capabilities. no replacement for displacement so to speak. but conversely the room had to be tuned to control all the driver surface.
relevant to the thread, could a current $100k retail speaker system compete in this room? probably get somewhat close, but i would expect you could tell what was missing, but it might not be too much. especially a horn (AG G3's.....$150k) could give you trade-offs. thought about that one.....then laid down till that feeling passed.
my 2 cents is that maybe the MM7's as a $200k speaker is not fair since it plays way above that price point in terms of ceiling performance. other $200k single cabinet speakers from 10 years ago were not nearly as capable to my ears. so it's delta compared to $100k speakers is wider than other $200k speakers.