Is it entirely because of the money that can be gained from the potential price increases, or is it because you believe in the tech? Maybe you do not believe in the BTC but other cryptos, that counts as well for 'believing in the tech'.
Believing in bitcoin's an important factor since the value of bitcoin itself grows based on the trust of its users. But more exciting, bitcoin is a major breakthrough in computer science was built and applied into cryptographic systems also a trusted crypto throughout the history of cryptocurrency.