i've made my whole inventory (100$+) from 5$ that i added to steam, i've been trading for the whole time i've owned this game, trust me, this happens on a daily basis but i finally decided to see what the hell are they thinking, and just as i thought, he's probably around 14. Also, undercutting ten dollars isn't a big deal when you're trading knives that are worth ~200$, my friend's trading at that price level and then it's ok since not that many knives at that price range get sold, so if one sells the price instantly drops 20$ or so. But when you're trading items below 100$, like me, the price is fixed and doesn't change that much, -4$, +3$. etc.