Why not? To what i know, the price goes down is the best time to buy as much as possible. “ Buy at low, sell at high” I believe that this is what trader always do when they want to invest in anything. However, “ buy at low, sell at high” not always true, you can buy at low as long as you still find the potential of its. To sum up, You still have to consider about your investment and only invest what you can lost, not invest everything you have.