the value always largely depends on the popularity of the attributes and it they fit the req. 20/20 on the same attribute is always valuable no matter the req, while 20/20 with mixed attributes isn't all the time, it depends on the combination, for example req df with 20/20 prot is valuable and req fire with 20/20 air not very much. a q9 20/10 air cele staff should be around ~10e (if im not totally wrong), a bit more maybe if somebody's looking for one with these exact stats. the problem with your amber staff is a) it's pretty ugly and b) nobody wants 20/10 air.
20/20 os wands and focus items are very valuable with all the same attribute, and even if the 20/20 differs from req but itself has the same attribute it is still worth a bit. generally every 20/20 os 1hand and offhand item is valuable and even 20/19 or 19/19 in most cases.
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