There's a bit of reverse psychology involved too. If the customer leaves irritated or won't buy because of problems or the high price, then the employee should feel that he's failed his training, rather than that he's pushing overpriced, buggy products.
OTOH, I'm a Genius because I'm running a no-cost OS on a machine I found at the salvage yard! Yuppers, "genius", not "cheapskate" ...