How does one determine the price(value) of an insert?

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I was wondering if someone could explain what makes an insert more valuable than another insert?
I assume that a single note replacement would be worth more than a note in a range of replacements but when you have a number of different ranges does this also affect the price.
For example is a  1 SNR worth more than a 3 SNR and
is a note in a 40k range worth more than a note in an 80K range and a note in an  80K range worth more than a note in 320K range?


FRIEDSQUID

Ask, how many were actually found?  That means more than what the range size is.

Obviously that makes more sense since not all inserts will be found in unc.
Also you may really never know how many were kept or not?
I guess I hard thing to really pinpoint then?

Thanks FRIEDSQUID