From the logic that I'm hearing. I would ask this question, "Why do we need sales personel if they only try to sell a sure customer?" Isn't the purpose of a salesperson to sell an item that one wouldn't normally buy or might be on the fense as to buying?
And if thats the case why not just hire professional drivers to escort people around town for a "Driving Session" and fire all of the sales people and just have a cashier.