In my case, I use bitcoin everyday... trading, making profit, sometimes I lose too. But this is no reason to not believe in the technology and potential of bitcoin. For it brings changes, people first need to accept it.
If you use bitcoin on a daily business you know the concept is good. The execution needs some fine-tuning though.
The same applies for many other things. I started trusting bitcoin f.e. when i read it has such a high market cap. Such a big load of money will not vanish all of a sudden.