David Foster Wallace, A Supposedly Fun Thing I’ll Never Do Again:
Advertisements have certain formal, legal obligations to truthfulness, but these are broad enough to allow for a great deal of rhetorical maneuvering in the fulfillment of the advertisement’s primary obligation, which is to serve the financial interests of its sponsor. Whatever attempts an advertisement makes to interest and appeal to its readers are not, finally, for the reader’s benefit. And the reader of an ad knows all this, too — that an ad’s appeal is by its very nature calculated — and this is part of why our state of receptivity is different, more guarded, when we get ready to read an ad.
…an ad that pretends to be art is — at absolute best — like somebody who smiles warmly at you only because he wants something from you. This is dishonest, but what’s sinister is the cumulative effect that such dishonesty has on us: since it offers a perfect facsimile or simulacrum of goodwill without goodwill’s real spirit, it messes with our heads and eventually starts upping our defenses even in cases of genuine smiles and real art and true goodwill. It makes us feel confused and lonely and impotent and angry and scared. It causes despair.