Firstly, I'm not certain of how the economics would play out: the "marvel or transformers nonsense" (and boy is it nonsense) tends to cost a lot of money to make, because they feature famous actors and they're end-to-end expensive CGI; arthouse films tend to be a lot cheaper because they feature less CGI, and sometimes the actors involved will work for less money because the films are more "worthy", or they like the director. More people watch the superhero drivel than the arthouse films, for sure, so perhaps it would all balance out, but it's unclear.
Secondly, while I broadly love Terrence Malick, if I'd paid £20 for "Knight of Cups" (which was dire), I would have to think very, very hard about parting with another £20 for his next film unless the notices were very good. I think you'd end up with a minuscule audience if you started marking up arthouse films in this way.
Unrelatedly, I have to admit that "Mank" sounds really boring and I'm not eager to watch it, even though I have a Netflix subscription and I've enjoyed many of Fincher's previous films (hell, I even liked "Alien 3").