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.
Trading is risky but provide opportunities for great profit. I think this is appropriate, for me, every month I buy bitcoin with budget $150, from $150 nominal I separate 50% that I will hold for long term investment and the rest will I use for gambling, trading, and buy altcoin.