Even if it drops, it surely make you gain if you invest more. It's not unlike the bank which has only less than or equal to 1% of interest if you invest. It is still may be the one easiest way to gain profit in an instant if you dont want to go to money market or physically ask a borker to hold your investment that has a high cost of brokers fee or additional expense. Simply the level of core advantage of bitcoin is more that drop happened.