Because nothing sells like a lie.
Brings to mind a favorite Simpson's episode:
Advisor: Little girl, do you think you can memorize this by dinnertime tomorrow?
Lisa: ``Mr. Burns: your campaign seems to have the momentum of a runaway freight train. Why are you so popular?''
Advisor: Very good.
Lisa: Mm. Well, as long as I'm asking something, can I ask him to assuage my fears that he's contaminating the planet in a manner that may one day render it uninhabitable?
Advisor: No, dear. The card question'll be fine.
Marge: Well, I think the non-card question is a valid...
Homer: Marge! ... Don't worry. My daughter's very bright, and I'm sure she'll be able to memorize your question by dinnertime tomorrow.