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'.
If you do not know whether you believe in it or not, you have not read enough about it, and then you are in because of potential gains.
I personally do not care at all about the reason, and there is not one of the two which are morally 'best'. It is completely okay to invest from the only belief and hope, that the money invested will become more worth. I just think it is fun to see
I also know that, if I believe in the existence of bitcoin all this time and keep trying as much as possible to make an investment with the support of irregular price graphs. The traders are looking for profits and are eager to continue to capitalize on the moment that the important bitcoin becomes the best hearted traders and investors.