from the story you told, it is an important lesson for all of us, where main income or fixed income is more meaningful and very useful for our daily lives in covering every need needed. a very simple example is for all of us, it is true that the income we can achieve with crypto will be greater than our fixed income, therefore use all of our money as best as possible
Do you mean that use your entire money in investing crypto? No, you are wrong, it was not advisable at all and I don't encourage it as it just invests only extra money.
I don't think that's the meaning of what he said, the latter part for which you may have assumed to spend all of it investing in crypto. IMHO, that means that we should be wise in spending it whether you invest or use it for buying things that you need or want.
Maybe you are right that some are earning more here but never make this a basis that we need to put everything we have because we are not certain of what will happen. And besides, not all have made a huge income because as you can see, a lot of people had lost in crypto also, and might this happen to you mate?
In a speculative market where everything is uncertain, someone has to be flexible and reactive with what he does. It's okay if someone who's focused in the crypto market and earns more than his/her day job. That's much better because a person that has other multiple source of income won't be problematic about his financial status.