Well, I was hoping for something at least a little bit more sophisticated.

Nah... it's brute force all the way down. Scammers aren't brilliant men in dashing suits who swindle bankers, they're assholes who prey on the weakest. The second you do something that doesn't mark you as weak in some way, they don't want you anyway. It's the human equivalent of scanning large IP blocks for basic security holes.