I can point out a few reasons why people around me use bitcoins :

1.You're tech savvy : You simply like technology ,especially code/web/programming etc.

2.You want to be cool:There are bunch of this kind of people who simply use bitcoins because they think its cool to have those "Bitcoin Wallets" and show off their balances.

3.You're a trader: Extremely inclined to the business side of the market.They know what future has for them,they prepare for it .

4.You're a investor :There are this type of people who buy anything and everything and sell it off to earn profits.Mostly they have money and good financial backgrounds so they just buy bitcoins as assets .

5.You're a gambler:Yeah finally,you want to be safe/secure/anonymous while gambling use bitcoins because the government doesn't give much fucks about online bitcoin balances.