You can pay professionals only for the practice, there are no guarantees, we learn our own experience. No less important is knowledge for choosing profitable ICOs.
Choosing the right project for investing is a difficult process, to conduct a competent analysis of the market and the project itself, not everyone can do it, over time, experience will come.
You are right, a successful project will bring investors the expected benefits. The main thing is to choose the project in which a strong team and avoid the scammers.