I'm particularly easy target for confidence gamers, those who use social skills to engineer responses they need to gain advantage.
I definitely don't think it has anything to do with stupid or intelligence, just social skills. Mine aren't that great; I think too much, and am too easily swayed by dangling a hard-to-solve problem in front of me.
I tend to not fall to email scams and such, where I can construct my response; it's the real-time social situation that gets me. And I have seen lots, from various billing scams to inept subcontractors to clients who see you as a source of work/resources to be exploited with such exploits being a "win", and so on. Also, I tend to not fall to the money scams, but to the more personal ones.
Scamming is a skill, and countering/shielding from scams is another. You don't need to be stupid to fall for a scam, just unaware and too trusting.
I would like scammers to be severely punished, severely enough to make that way of life a non-starter. Instead, we have people who glorify it, as heist movies and such (Ocean's Eleven comes to mind). Indentured servitude for twice the amount of resources at risk would be a good starting point, in my opinion, but my opinion is probably a bit too severe.