Bad Agents

I'm not talking scammers. I'm talking bad as in can't sell books to save their lives. Bad that editors ignore submissions from said agent. Bad that when you ask have you ever heard of so and so your first answer is "Run". Yes, they exist. Yes, they go to conferences and hob knob and take appointments.

But the question is how: Well, I have a theory: desperate authors is how.

I know and understand the need to rush to NY. I know and understand how it can be a light at the end of the tunnel when someone finally says, "Send me the full" or much better, "I want to represent you." It's the "I'm King (Queen) of the world" type of feeling. But the question is how well did D.A. research this agent? How many e-mails did D.A. send to current and former clients (politely) inquiring about said agent? Did D.A. even check out this site to see what are the basics of an agents job? How many warning flags went up that these types of authors ignored?

* Yes, I'm aware some author still get the short end of the stick with very bad matches with their "dream" agent.*

So you tell me: How are bad agents still able to work in this business? What are some of the signs to look out for?