For speculation? To buy on the dark web? To buy online on sites like purse.io? To send money? To do business? To have your money under your control?
What is/are your purposes when yu buy bitcoin?
Bitcoin is one type of investment which we can make profit through trading, where as in fiat we can do trading but it's two risky when compared to bitcoin.I am not investing all my money into bitcoin just a spare money which will make me some more money from it with the knowledge i have.
When it comes to trading everything is risky. If you dont have the courage to take the risk then you cant move forward. Even with commodities and other things where you could invest there is always a lost whenever something bad happen and you dont know when it could be.
Everything that has possible profit has risk. No risk, no gain yes that's how everything goes with it. But there is also some low risk investments if you are going to buy bitcoins.
And you can just simply store it to your wallet and just wait for the price of bitcoin. On that way, you can get profit without doing some hard efforts.
This is the most popular reason of many people on why we are buying bitcoins.