I don't think 1 stn unsold is enough to warrant excluding 3(!) higher sales here. That means we're leaving out 3/4rd of all data points.

In the end, listings on websites like scrap or stn are only available on those websites. This makes it likely that the listings there are seen by less potential buyers. To me this makes an unsold on a trading website like that, a little less meaningful than an unsold on backpack.tf - and as such I would be a bit cautious using them as a reason to exclude higher sales, especially if there's 3 of them.