Bitcoin is known for its aggressive bull trends. There are many risks associated with owning bitcoin such as volatility and keeping your coins secure from hacks. That said, there are also many positive benefits for including bitcoin in your portfolio.
#1: Store of Value
The value of bitcoin is based purely on free market consensus between buyers and sellers. Since the supply of bitcoin is fixed, the value will increase based on the demand of new participants. Right now the user base is still fairly low which means means bitcoin hasn't reached a point of market saturation yet.
Bitcoin operates independent of the legacy markets and lets you store value without needing a broker. World governments have been implementing bail-in regimes that can remove the money in your account to prop up faltering banks. With bitcoin, if you keep your private keys secure then nobody can access your money stored on the public ledger.
It's possible that Bitcoin will continue to grow as a global network. If it ever hits the steep climb on the s-curve of user adoption then the price could make rapid gains. To put things in perspective, $100 investment of bitcoin in 2010 was worth $1.8M at the end of 2013. If Bitcoin ever gets the same level of user adoption as social media then owning a full bitcoin will be extremely rare. Each unit of BTC is divisible by 100 million.
Disclaimer: This article is my personal opinion and not meant as financial advice.