You need to be able to lose what you can afford, because ICOs are so hard to guess, but when you need the right and the proper project, it will make you profit 10 or even 100 times? Yes, it does.
So, you need to read properly about its project from roadmap, whitepaper, the team, how they work / contribute to the projects, how they solve problems.
The best for me to invest in ICO is spend a few and following the bounty program.