This has been brushed upon a few times throughout these OTs -- asking to buy used is definitely a valid stance, but asking us to not buy them at all just isn't fair (and also addressed in the OP).
Sexism exists in almost every game in some form or another, and trying to avoid it entirely would pretty much mean just giving up gaming for good or sticking to extremely limited options that may not even be fun for us. Like, I'm just not much into most indies or western games; I don't care for the art direction a lot of the time, I don't like playing as generic middle aged white men, 2D games are harder for me to get into, etc etc. Versus with jprgs, I love the art styles, I love the epic stories and wild character designs (when the girls aren't stupidly sexualized), I love the combat systems, etc etc. If I want to be able to enjoy more than, like, idk just HZD? I kinda have to put up with some amount of bullshit.
Plus, women and those who are super against sexualization are already getting ignored by the devs & marketing as it is. It's not our money they're pandering to and angling for, they don't care whether they have it or not. So ultimately and unfortunately not buying them just isn't really gonna make a worthwhile statement or difference. If anything, women and critics leaving these gaming spaces due to not playing anything is just gonna make the problem worse.
And besides, perhaps the argument of 'moral responsibility' would be a bit different when applied to men, but as a woman I see no reason why I should give up what enjoyment I can get when I'm already on the shit side of the stick to begin with.