The thing is, you have to make mistakes to learn from your mistakes. You can warn people about the dangers of Ponzi schemes and also the risks associated with Alt coin trading, but there is no guarantee that they would listen to you.

We all followed a similar route on our journey, because we are all human. Greed is part of our lives, so once you get a taste of Crypto currencies you are driven to accumulate more and more and you sometimes take bad decisions because it looks like the quickest way to get to that next coin.  

There are no quick way to become rich, you have to work hard and be smart to reach your goals.