Yes, I agree with you that if it is not the only income that you have it is much better to just save it and wait for the right time to sell it when its price is high.
Or you could sell some of it if you have many and try to grow it by investing it to some good investment sites. It would be nice if while earning it you could still earn some from it by trying those bitcoins to work for you.
Yeah patience is the key in trading, even if price falls you should not get panic and should hold your coins until you are not making some good profits from it.
I trade the bitcoin with some good altcoins. So even if the altcoin price drop, I will not panic, as they will rise in the future.