"Only invest an amount you can afford to lose."
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.
You are right... I always say Invest what you can give away...it most not be little or too much, Don't put all your eggs in one basket
Reasons are if you invest too much let's say 90% in a particular investment...(Bitcoin) All the direction will be towards that investment and if there be any delay or setback, onlike what we are seeing now... The stress you or your organization will go through