Yes you made a very good point but most of our problems are over greediness,in life we don't need to be too greedy,as long as you plan your investment and have some certain price in which the Bitcoin  will rise to and you will sell your Bitcoin and take the profit and start up a fresh investment,if you can continue to maintain your stands and your plan believe me you will continue making progress little by little.

I know it May not always be at your faviour but the chances of losing totally will not be much, unlike what over greediness will cost you.. whenever you get to your target,you don't need to go further, make use of what you achieve no matter how little as you do that continuously so as to achieve your primary goal, and before you could know you will arrive at a point you can go beyond that.

Be contented with the little that have added to your capital  investment and learning how are reduce risk in investment in order for you to be able to achieve your primary goal..