Each item would have its value on the bottom of item tooltip .
This would contain the sell price in the bazzar or the lowest price of a bin auction.
The profit Calculator would be getting used inside dungeons or in kuudra whenever you are viewing a chest .
It would display both the profit and the chest value .
Profit = item values - Chest price
While using croseus , you'd have an option to highlight unopened chests and the profit Calculator would work there too once the the collection of chests is collected .
If you a dungeon chest key in your inventory the next most profitable chest would have undergone profit calculation.