Saving is for those who are afraid to risk and don't want to try investments. But anyway, doing trades is not a bad idea, in fact, if you do it correctly you could make your bitcoins more and more out of trading it again and again. Price of bitcoin I think could wait you when it is on the top, but while we are waiting, lets make more bitcoin, so when bitcoin price increases a lot, then we have a lot of money waiting.
some people are not totally afraid of risks, they just chose to save because they have a different mindset and plans with other people . but still saving is not yet enough in my opinion although you need to save in order to sustain your future needs but also you need an investment too in order to gain profit and grow or maximize your savings . these two must be coexist .