It seems this is a sensitive question because if we know for sure good bonus projects, we are rich. Just search for any project you want to join. Sometimes a quiet project and few participants will give you bigger rewards than you expect.
If we know those projects that can bring good returns back to us, no matter what they run ICOs or IEOs, we will definitely get rich from our capital. But life is not perfect like this, and life is not a dream; we all make mistakes with our investments, and we will get losses or profits. What we should try to do is reduce rates of losses from bad investments per total investments we do.