With bitcoin you can get a piece of freedom back, be your own man, be your own bank.
A lot of people use bitcoin just to make a statment. And with bitcoin they find others who think the same way. Bitcoin connects!
There may be people who are using Bitcoin to make a statement, but they will be in a minority. The majority of bitcoiners are those who dream of making millions when Bitcoin goes to the moon.
Even if it doesn't go to the moon, we could still make decent profits by trading Bitcoin. All we need is volatility, and that Bitcoin has in abundance. In this way, it could be claimed that Bitcoin is a risk-free, bullet-proof investment. Its price can't go down dramatically since its user base is constantly expanding (which could be seen by the gradual growth in the number of transactions), and, at the same time, it can't be stable since it is mostly traded, not used in real life on a wide scale (which could bring down the volatility)...
Either way, you can earn profits, if you don't stand gaping, of course