According to recent recearch, 56% of 2017 ICOs fail. And you know what? That's OK. 90% of startups fail but the rest grow so high that they compensate venture investors 90% loss and provide very high profits.
So the basic rules with ICOs are very simple:
1. Do the research before you invest
2. Diversify, diversify, diversify
3. Ignore news and HODL
All things considered thats actually a pretty low number. If I were to have guessed I would have said it was closer to 70%.