This article is from the rec.audio.* FAQ, by with numerous contributions by Bob Neidorff others.
Some do and some don't. Some will treat unpleasant customers
badly and treat friendly people well. Most sales people aren't
wealthy. They sell stereo to make a living. If they can sell
you a more expensive piece of equipment or a piece of equipment
with a higher profit, they will make more money. Usually, this
figures into everything they say. Some sales people claim to be
Some sales people really are open and honest. They may starve
with this approach, or they may have a nice enough personality,
a good enough product line, a good enough store behind them, or
enough technical background to overcome this "limitation".