The sale makes more sense to use on the item in question

In this situation, the heart flamenco added 60 keys to the sunbeams flamenco

60 keys alone is more than half of the heart flamenco's price

so theoretically, if this heart flamenco is 77 keys and i use it to update the sunbeams flamenco, the sunbeams flamenco can be updated

but lets say i try to use the sunbeams flamenco's price to price this (taking sunbeams flamenco at 130 outdated just as example)

the value of the heart flamenco would be 130 minus 60 keys, effectively giving this a value of 70

but using a bulk trade like this isn't a good representation of the item's value, the heart flamenco in this situation takes up like 55% value of the trade

all of this considered, this trade is better used to price the sunbeams flamenco because it isnt appropriate to use it vice versa

this kind of situation is normally applied to bulk trades or situations where the other item in question has less sales

for example, lets say you are pricing nebula translator which probably has 200 sales

one of the trades you find is RandomOutdatedHalloweenUnusualX, and that hat has two sales total: lets say one for 170 keys and one is the nebula translator

instead of adding the price point of RandomOutdatedHalloweenUnusualX to the large number of nebula translator sales, the sale for the nebula translator is "better used there", as in its better to give RandomOutdatedHalloweenUnusualX a price point of 170 and the nebula translator, to give it a range