A salesperson can sell you something you don't want.
People buy to satisfy needs and wants.
A salesperson may help a customer to identify their needs and wants but customers only buy when they believe the product or service they are offered will satisfy them. Selling is not about seducing or coercing the client into buying something for which they have no use or desire. Successful salespeople use a lot of tricks and gimmicks. Tricks and gimmicks are the tools of the old style salesperson. Today's buyers are too sophisticated to put up with these tactics.