That's right said. In order not to regret the lost money, you need to study the possible object of investment as much as possible. Then his prospects will become clear and, accordingly, the prospects for obtaining a profit in this project.
It is difficult, of course, to evaluate possible prospects for projects by studying its Roadmap or White Paper. But this does not mean that it is not possible to conduct an analysis of the project. For example, I always study the objects of my investments to the maximum.