Ethics of con artists

[Spongebob]

OK, darn.  I thought I detected a hint of an idea there.  So to address some who consider gullibility a justifiable reason to con someone, what about the more sophisticated cons out there.  These people are getting more and more complex.  Is it ever justifiable to take advantage of someone's confidence?  To put another way, to steal someone's money by misleading them?  I suppose I was raised on a culture where being honest in one's business was as important as being honest in any other pursuit.

You've never had a job as a lawyer, sales or in advertising have you? Specifically advertising is designed to trick people into spending more money. Is it ethical?

No, no and no.  And yes, I'm aware that advertising & marketing are simply devices used to sell products/services.  I don't find it particularly ethical to misrepresent those products.