Earlier quoted context omitted.
But they have to ask, because if the answer is no, that's a huge red flag. "You are willing to lose my money, but not your friends or family?"
An investor should be willing to make a "10% chance for a 100X return" type investment, but no, I wouldn't usually suggest that to my friends and family unless the amount of money was not significant to them. I don't think that's a red flag; investors have different risk tolerances for good reasons.
It helps you determine how much of your bankroll you can wager depending on (1) the odds, and (2) the size of your bankroll. It's the same reason why you shouldn't (mathematically) play the lottery (when it's expected value is actually positive) unless you're already filthy rich. The same math applies for hyper-risky startup investing.