Bitcoin is more of an investment instrument, a "digital gold". The price of gold also fluctuates, on a lesser scale but it is expected considering the fact that gold is known for many centuries, but bitcoin is still in its early stage. Exchange rates of different currencies also fluctuate.
Bitcoin fluctuation is very good on one side and in not so bad on the other side. On one side the fluctuations or up and downs are good for those people who are not the part of Bitcoin and want to avail it but are with low savings so it is difficult for them to enter into it so the low market price will [provide them with the opportunity to afford Bitcoin at low price and then by holding that coins a time will come when the price goes high and they caste the opportunity.