I appreciate you showing your mortality. I started to expect you were the most positive investor here. I try to be positive and I think a lot of other members are trying to remain positive but the last few months have been difficult for all of us and we see people starting to struggle with every day life and not just btc which means they might have to dig into their investment which could mean losses because btc is down.
Its important to plan for the downs as well as the ups or you can get squeezed by real life emergency's.
I always advise to have 6 months living expenses as a cusion.
Never over expose yourself and plan the downs to last for years.
This is why you will see the smart holders take profit at tops.
I will say it should not be a fixed amount but what ever you can afford to invest. Many people are living paycheck to paycheck and only have a small amount left over every month. Youngsters are the ones which do not have many cash flow because they have yet to accumulate it. $100 might be to steep for a lot of people but if you can afford $100 I think it is a great start.
This, investing should not be gambling.