People buy cryptocurrency because they expect the price of cryptocurrency to rise in the next few years.
Yes they are sure about growth of bitcoin and it will grow for sure, now bitcoin is increasing in price and it will be high in future, people have faith for bitcoin that it can make their life better which is entirely true bitcoin has much potential to change our life and make us earn high profit after every investment, as can save our future with bitcoin if we hold it with patience for long time, for me bitcoin is more than anything else so I will keep on buying it.