It is not just that without risk there is no gain, it is that there is an inverse correlation between profitability and risk both for betting, for investments and economic matters in general.
When you get 100 for every 1 you bet on a particular sports bet, or casino bet, I don't care, it's because the risk of losing is very high. If, on the other hand, you get 0.98 for every 1 you bet if you win, it is because the probability is about 50% (like playing red or black roulette). For investments, if you put money into an altcoin that has just been launched, you might make a x1,000 but because you will most likely lose money. On the other hand, if you invest in bitcoin, you are not going to make a x1,000 this cycle, but it is much more unlikely that you will lose money.
With this in mind, we will be better able to manage our money.