Investing in ICO could be profitable but the risk of losing your investment should also be taken as a consideration. There is no guarantee that you'll be successful just because the project is good. Even titanic - the world's most luxurious passenger ship drowned to the bottom of the ocean. So I say invest what you can afford to lose.
I personally said that if you invest in ICO you have to be careful because many people who invest in ICO don't get anything so before you invest in the ICO you better see the white paper and the work team because then you can see the good and bad The ICO