I also often hear this sentence, but for me, it is "Only invest the amount you can afford to spend" Maybe because my investment is only according to the capacity I currently have and I can allocate at this time for Bitcoin, whether it's $10 I'll definitely set aside. Either it has become a tradition or I really believe in Bitcoin. However, that is why I will allocate the remaining money after all the requirements at home are met. If it's still not fulfilled then I can't allocate it for Bitcoin, but it becomes double when I already have more funds allocated next week.