Forget about "the check is in the mail." The biggest lie in sales is when a candidate tells you that they can close anyone, as long as you can get them in the door.
The problem with sales isn't just closing. An inability to close sales is usually a symptom of a deeper problem - one that's often closely tied to an inability to generate qualified sales leads. So if you think that by hiring Mr. Confident you've solved half your problem, think again. You've just highlighted the other half.