I often wonder after how much, i would start getting suspicious, if someone asked to lend or give them money.
Even if it was family or friends, I'd need a pretty good reason for HK$500. For over HK$ 1,000 I would ask a few more questions to get more details and make sure they weren't lying. $10,000 would be maximum for my mum and then I would need all kinds of proof of invoices and quotes etc that she was gonna spend it on what she claims.
How do people pay $100k, then a few million to strangers who call up without even checking?!