Some of these scam victims are duped into trying to help someone they trust with a financial problem. In that case, the victims are being the opposite of greedy. The only character "flaw" I can think of in these cases is being naive/too trusting.

I don't know how common the "savior" victims are vs. the "get rich quick" victims, but they definitely exist, at least according to various mini-documentaries on pig butchering I've watched. Maybe these victims were modifying the story to seem more sympathetic, I can't say.