Refining with return rate: how to calculate real cost by step

In refining, returned resources change the effective cost of the operation. Ignoring that return often makes the calculation pessimistic or distorted, especially in cities with favorable bonuses.

Step-by-step analysis helps identify where costs concentrate and which tier actually sustains the margin.

The refining city and station fee directly affect profit. A fee that looks small can consume a large part of the margin when volume is high.

Compare scenarios with and without focus when it makes sense for your account. Focus is limited, so it should be reserved for operations with better return per point spent.

Use total ROI to compare refining groups, but also check absolute profit. A high ROI on low volume may be less interesting than a lower margin at larger scale.

Before buying materials, verify whether available volume supports your initial quantity without pushing the price up.