So here's a tricky market question! I'm looking for opinions, and not a 'right or wrong' thing. So maybe folks can share their opinions!
I noticed that because my auction slots are limited to 40 per character. That I'll specifically try to min/max what I sell. In short--this means I very rarely will craft and sell low level gear and items. Even when I've noticed there's literally ZERO quantity of those items available.
I sometimes wonder if people trying to min/max their profit by skipping low-tier and mid-tier items can affect low level players by reducing the availability of upgrades. Food for thought!