It’s misleading. Let’s assume that I am selling an item for 1 silver. The UI tells me that the “Projected Profit” (which only takes the 10% sales tax into account) is 90 copper. But that is not correct. The profit is actually 85 copper, when you factor in the “Listing Fee” cost.
Plus, it’s not necessarily a “profit” either. Because if I have bought the item at a lower price (let’s say 50 copper), then my “profit” is 35 copper, not 85 copper. But the system has no way of knowing that.
So instead of calling it “Projected Profit”, maybe it should be renamed to “Projected Income”.