Its not that buyers arent important, but on many items, buyers are inconsistent and constantly moving up and down between values. If this happens, it means that buyers from one specific snapshot in time should not dictate the entire price, since otherwise you can make a new suggestion on any 2 ref hat to constantly rise and drop it between 1.89 and 2.11 (or something like that).

Especially when the suggestion relies on sales to and from bot buyers/sellers, the overall suggested price reflects how sellers and buyers have fluctuated the past month, giving a more appropriate representation of what the hat can sell for at various points in time.

Rarer items like this one are treated differently from the default ruleset for non-unusuals, and will be treated more in line with how unusuals work. In this case, with 3 sales so close together and one that is almost twice as much, it is clear that 103 is the statistical outlier. With these sales, I would not consider 103 as potential part of the range. An argument could be made that it is better left outdated if buyers are consistently higher than the lower end sales, though it seems that that is the common trading point here.