Who said "A smile costs nothing, so charge for the real service."?

This quote is attributed to Quark.

A smile costs nothing, so charge for the real service. - Quark

"A smile costs nothing, so charge for the real service."

Quark Work

"I'm a Ferengi. I don't have principals, I have profit margins."

"The way to a woman's heart is through her ears."

"A woman is like a warp core - handle with care or she'll explode in your face."

"Profit is its own reward."

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."