I do see your point but also if more people starts buying the more sustainable options, they will get cheaper because of increased demand? I started buying organic, non bleached cotton ones a few years back, I can thankfully afford to but also I decided that if I eat well and don't use skincare with mineral oil and silicones, I don't want to "shove" plastic up my vagina either. But never in this time I looked down on someone who uses non-eco friendly tampons or pads because they can't afford to.
I think the pressure to make menstrual products more sustainable should be on brands, particularly big brands who are less likely to, so then the products are cheaper and become the only option available and every menstruating person can buy them regardless of their earnings.