Before you invest into any Ico you should analyse and do some search about the roadmap of the coin, the team, what is bringing new, if you invest without get some information besides someone say it will get 10-40x its value on the next months. Icos has becamed an amazing source of income, but there is always a risk and coin can be dropped and kill it.
You are right, careful investigation and thorough research is very important when investing on ICOs. Some of them are good but most of time they aren't good enough and very risky.