When you are investing in an ICO just know that the possibility of success and failure of the ICO is 50% failure chance and 50% success chance and the same principle applies to your money.
But if a person have knowledge of studying an ICO then he will know that which ICO will get success and which ICO will get failed. Many people who do not know about that things have to invest only when the project collect their minimum required funds for starting the project.