There was a time when people used to buy gold and other jewellery metals to make a fortune with time. Now same thing is going with crypto currencies . They may go down for a little time, but n long term they are increasing as hell, just the way gold did before.
Just this data is enough--
if you bought BITCOIN worth 50$ in 2009,i.e. 10000 BTC at that time, it will be worth 30 MILLION $ as per today.
same trend is now being followed by ethereum and ripple.