The increase in the demand and usage of Bitcoin is the basic reason why the market value of Bitcoin keeps pumping for time to time. And when demand rate increases with a fixed supply rate, the market value of that product also increases. In the case of Bitcoin, the demand rate of it has increased from the launch till now and there is also a fixed amount of it.  Once there is a fixed number of Bitcoin to be in circulation, the market value of Bitcoin increase as years go by. So the basic reason why the price of Bitcoin will keep increasing is the fact that it has a fixed supply and the its demand in the crypto ecosystem will keep increasing.