As a broker, one of the traits I tell aspiring agents they must in order to be credible is courage. Courage to tell the buyer or seller they are representing the truth as they see it. Seth Godin touches on this in his latest blog, "Where Have All the Agents Gone?".
The most common example of this is when many agents get the chance to take a listing, they feel pressure to agree with almost anything the seller tells them in order to get the listing! Competition (or lack of business) breeds this insecurity, but in the long run, it's a huge disservice to the seller, and ultimately to the reputation of the agent.
It's hard for sellers to walk away from a higher suggested list price that an agent may be quoting, or, from a discounted fee, but these are often siren calls and wreckage is ahead! Find an agent that has plenty of business, and a good reputation in your marketplace. My experience is they are far too busy to waste anyone's time on overpricing a listing, and don't want the ding on their reputation from a listing that just sits there for six months because it is essentially invisible!