Trying to educate casual sellers is pointless. They don't care and squirm in discomfort at the thought of learning how anything in the game works because learning implies taking it seriously and taking it seriously implies treating it "like a job." They'll shoot themselves, you, and the nice old lady across the street in the foot if that's what it takes to "succeed" in a way that is intuitively appealing to them. Just accept they're part of the market and exploit their incompetence. Weekends are for buying.