Everyone finds in using Bitcoin something important to him.
Personally for me the important thing is that the Bitcoin is very good to use for long-term investment. That's why I'm buying Bitcoins.
I think most people who are buying Bitcoins now are doing this because the long-term investment opportunity. I'm one of them, but I'm not using Bitcoins only because of it. I like to have the possibility to gamble online with Bitcoins, as it's forbidden in my country or very complicated to gamble in official casinos, need to had credit card, and it's not possible to bet so low like when betting with satoshis (since 1 satoshi per bet). It's a good way to earn money online too very simple, without the needed to use nasty services like Paypal...