Joining ICO is not very secure, because there is always a risk that the project will die and you will lose money. But ICO can give you a very good earning.
Yes that how it work now in ICOs. Even very good and promising , hyped project can make a big loss on the market. And you cannot say when ICOs will bring a lot of x and when you will loose your money.
Be very picky with ICOs where you invest!