On Fort items, once I figured out the top end, I was guessing that a Fort upgrade loses half its value for every point below perfect.
I don't know if this is right, but if top end is like 100k, then
30 - 100k
29 - 50k
28 - 25k
27 - 12.5k
... etc.
That's been my rough price guide, but I am just guessing.
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