Yes, it is indeed a risk that you need to be willing to take, but it can be extremely rewarding. If you pay enough attention to the market and how it changes, you start to slowly get a feeling for it. Sometimes that helps a lot. Sometimes the market changes so fast you start to think you have absolutely no idea what you're doing. Overall, for me, the risk is worth it, because it's a quick way to make some extra money that I can later reinvest into something else, or just put some into my Hive Power.