That's absolutely no reason to feel naive. Many scammers are actually working for organisations which send out hundreds of thousands or even millions of messages and emails every month: they use a scattergun approach and just wait to see who replies, then sound you out to see if you're likely to fall for it or not - they haven't selected you especially for any reason and, as you say, they clearly rapidly realise you're too intelligent for them to continue trying. That's something to feel proud about!

Just use common sense like you do, of course, in real life/answering the phone, etc.

It’s what they do. They have rooms of men sitting at computers in third world countries using stolen pics.
Become a member of the groups, learn their MO’s so you can protect yourself and our community by extension.

I need to see what one of these scammer profiles looks like. Where can I find the Watchers Group?

You might also like to see "Dirty John" on Netfix. Based on a true story.

Don't feel naive. These scammers are professionals, they have honed their skills to the max. You recognized them so no need to feel bad.