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?
I don't buy bitcoin. Because buying bitcoin is a very cost thing usually in my bitcoiner network . So i never made buy of bitcoin but I usually uses the bitcoin of the signature campaign payout for trading , which is going very well for my career from long time . j usually make 0.01 btc per day through trading which is not bad .