Selling seems to be seen here as "conning". Having spent some of my best years trying to teach the art of selling, which means to excite desire, and then to motivate a decision in a WILLING prospect, has nothing to do with trickery or slick persuasion.
It is establishing a recognisable need and HELPING a client to satisfy it.
Having spent a long time, "trying to turn mules into racehorses" I may say anyone who claims they can turn \ignoranti into competent sales persons in a short space of time is a liar and/or a con artist.