This rule works well not only in crypto-currencies. Wherever there is a high risk - there is an opportunity very quickly and very much to earn. But this is possible for a very small number of people.
Exactly!! Before you invest in bitcoin you should know the risk you need to take, you take that you can get high rewards but sometimes, you take the high risk resulting higher loss, so be carefull with that, you must have strategy on how to handle your bitcoin and observation