It is pretty much the same situation in CS2 trading. Most of the time when someone feels like they got a bad deal, it comes down to not knowing how float values, wear conditions, or pattern indexes affect what a skin is actually worth. The system itself is consistent once you understand how it works. There is a good breakdown of all of this at
https://dmarket.com/cs2-wiki/ — it explains skin mechanics, market pricing logic, and how different factors influence value in a clear way. Reading through it before trading makes a noticeable difference in how confidently you can evaluate what something is worth