Quality level being tied to level is pretty good actually, I'd prefer to see something more like an individual level for each recipe and having the option to select the level of quality of the made item (don't know if this is possible but it would be cool). But for now, having the quality of crafted items tied to level creates an ability for any would be zombie killer to sell armors for a variety of prices. Obviously purple equipment would be more valuable but lesser quality like green would be cheaper. This would create a stratified market in which everyone could participate in the movement of goods.