There are various reasons to use Bitcoin, ranging for sentimental and beliefs to financial reasons devoid of any emotions, First of all, The anonymous private nature of bitcoin attracts thousands of not millions from those who believe in a decentralized private payment system, Also, Considering the big potential for growth in value, punters and Forex traders are switching to bitcoin as well.
Regardless of all these reasons, it's a cross-boarder unregulated payment system allowing payment to other countries with a fee of $1-$2 which is cheap for that kind of transactions.