Short term investment is a good investment also.as long as your investment are profitable.but this short term investment are very risky.we dont dont if your investment are become profitable or it will make you bankcrupt.
Yeah it's risky but better to know what coins should be hold for short or in long term.
But in the case of bitcoin, even we hold it for short term still we can have a good profit. Of course you need to closely monitor the market so you'll know when you hold or let go. And I can say that bitcoin investment is much more profitable than saving your money in bank.