"All advertising is exaggerated. Nobody believes it." This statement, made in a courtroom by a company's attorney in defense of its advertising, led to the formation, in 1912, of the Better Business Bureau.
Those were the days of snake-oil salesmen selling products that could cure anything. If you assumed the attorney was representing one of those companies, you'd be mistaken: His client was Coca-Cola. (It was cleared of the charges.)
The entire business community suffers if consumers don't trust advertising. Businesses that make offers or promises they can't keep, and maybe have no intention of keeping, steal sales that could have been made by reputable companies.