Wow, there's more tension in this thread than on the Plugged Nickel set itself 😂
Seriously, though, it is very odd that the music has not been re-released on CD or LP since the boxed set/doorstop as far as I can tell. I have fond memories of first hearing some of it at my aunt's house (she used to post here), when I was first getting interested in jazz. The band was on fire and their collective search is riveting. I bought the set used, eventually, for a price that was not too insurmountable.
Miles' 100th is next year, and maybe we can expect some of these boxes to come back into circulation.