ICO's are like shares in a company - I think this is the safest way to invest in a project you believe in, because only you have acces to your investment and you can choose to get out whenever someone is willing to buy you out in a cryptocurrency exchange.

I really enjoy the idea of supporting revolutionary technologies, my investments are based on the idea behind a certain project.

Be very careful though because there are a lot of scams out there, be sure to check out the whitepaper, the team and what other people are saying about them.