One miscalculation and everything vanishes. A single aggressive trade, going all-in on conviction, or holding through a liquidation you're sure will bounce back—that's where fortunes evaporate. The market doesn't care about your conviction. The leverage that amplifies gains works just as brutally in reverse. Position sizing fails, risk management gets abandoned, and suddenly your portfolio is decimated. Most don't realize how thin the line is between profit and ruin. It takes discipline to survive in this space.