They do, but obviously they're not very smart.
Let's be honest here most of the scams that go on around here are done by people who aren't exactly mental giants. That being said, the most effective scams have been run primarily by long cons - people with planing and thought put into their scam.
Yeah, longcons and even scams can be genius. These scams are just pathetic daylight robberies perpetrated by moronic goons who usually end up empty handed.
Which came first, scam or scammers?
Idiots came first and smarter people capitalised on this.