Scammers aren't usually very stupid. At least the ones who make loads of money aren't. They are still rotten to the core though. These days anyone can have a prety homepage and get get a PHD. It doesn't make them honest.
Check out the twenty worst agents: This is the version from Writers Beware. This is the fancy version. And this is the story behind why it is so important not to let these people win.
Also check out Preditors and Editors before getting involved with any agent or publisher.