More broadly, I think it's important to distinguish (more than we do) what aspect of justice a fine is supposed to be for, particularly between restorative versus punitive. The first is what it costs to fix measurable damage-done, the second is what we need to ensure the person cares to change their behavior.
Restorative fines should include not only measurable damage but also compensation for damage that you can't easily measure or quantify, which is why these things get blurry a bit.
