I.also don't bet big amounts, that is not for me. No matter how good odds might look I don't take big risks.
It's possible to make big money with betting, there are also some examples that I know but for that you need to play big and also lose big. It's not possible to win all the time and at the end the question is how ratio between won and lost actually looks like.
Yes, we know ourselves better than to risk our money for something that is not good for us. We could place a small bet while we enjoy the sport, and we don't care about the result because we only want to have fun. If we use big money, we should know that the big risk will be behind that money, so we must accept the risk and take it.