Contracts often experience a big drop, but after you open a short position, it will rebound and then fall, and you will be stuck with this rebound. Unless you open a short position and it rises and falls all the way without a reversal, you can make a big profit. High-leverage contracts cannot be used for long-term leverage. The more you want to double your assets, the more you will close your positions. Even the 20 or so U of profit from a 125-leverage contract may not be enough to pay your handling fees.