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 a good commodity as store of value. I buy bitcoin for saving it due to long term investment.
I like the idea of avoid inflation which the value keep growing over time, as I don't believe on fiat money to save my wealth.
Divide your wealth is a great planning just in case something bad happen in the future.