Why BitCoin Is a Dangerous Investment?

As a famous quote is "to be successful, arrogance and confident is most important." the same quote can be applied to the Bitcoin business too, but most of the top of the investors and even millioanires and billionaires is not investing in Bitcoin, if they do, they can easily convert a million to 10 million but they are not doing the same and the reasons are:

Some billionaires and millionaires consider it a balloon, and it can burst any time, the day this balloon bursts will be the bad day for the investors.
The other very important Reason people give to support its argument against investing BitCoin is that "No Country allow you to buy or sell any product on their country, its price is increasing and no one knows why is it is increasing.
In Recent days, bitcoin price is increased and at the same time, investors invest a lot of money on Bitcoin and after 3 weeks its price is still go down, which shows that the bubble is very near to burst.

Think of the situation that i will give you $100 and every day you will give me $50, and you don;t have to invest my $100. Can you do that for me?

But, there is an opportunity for the people who are interested in short term risk.

The opportunity is to invest a given amount of money on bitcoin, for a day or two and then pick up your money as quickly as possible (when the bitcoin price increases)