To many things may go wrong. You may need to buy something (very important for you) and don't have the normal money to buy it. You may decide to use your bitcoin to do such bought. If you do so you will have not more your bitcoin and in this way you would be poor (with the full meaning of this word if we accept as a true the hypothese of the being to high of the price of bitcoin in the future - lets tell 10 000 us dollar one bitcoin). But can go even worst. You may decide to invest your bitcoin in order to have more than that one you have. Normal thought. Everyone may have such kind of thoughts. But your investment may go very bad and you may lose it. In this way we are in the same situation as above but even bad. If in the first case you had something important for the moment from your bitcoin in the second one you had nothing.

But exist yet an alternative to correct both the above situations and all the other bad possibles.  Buy as soon as possible at least another one to have it as a reserve in the case of the verification of the above or other situations. In this way you will be protected from the possible bad luck or the possible bad decisions make from you. Put this coin in another wallet and forget about it. Put a reminder in your mind to remember that it exist after 20 years and all is done. You will have one big bitcoin in the needed time.