There's tons of reasons to invest into cryptocurrency.
1) First of all, you can make lots of money by day trading tokens or even holding for a year or two is very likely to increase your investment.
2) Most cryptocurrencies are some form of decentralized financial transactions, which gives you more freedom to spend your money on what you want when you want without going through the banking industry
3) You can actually support projects directly by buying coins and holding them. So if you see a project that could actually make the world a better place or whatever you believe is beneficial you can support it directly, again without intermediaries that can head off your funds.
4) Honestly, most importantly blockchain technology is the future. Investing in cryptocurrency at this point is going to put you leaps and bounds ahead of people who adopt this 2-3 years from now once it becomes more mainstream.
I think it's really important to get in on these things early and we're still at the beginning of cryptocurrency, there's tons of things still yet undiscovered.