Bitcoin is a world first crypto currency, bitcoin have a future.Many people's make their future in btc. Now bitcoin price fall down, and obviously btc perice grow high, and when sell it and earn many profits seriously.
In is cause People are still buying BTC.
Some peoples buying bitcoin for investment and some peoples for speculation. Cryptocurrency popularity growing and peoples knowing about crypto market, many peoples want to earn profits from this market. As biggest market cap in crypto market, many reason peoples buying bitcoin and i think most of it is for investment and speculation