In the old days, advertisers ventured on their own opinions. The few guess right, the many wrong. Those were the time of advertising disaster
Genius is the art of taking pains
Impressive claims are made far more impressive by making them exact
Whatever claim you use to gain attention, the advertisement should tell a story reasonably complete.
Picture what others wish to be, not what they may be now
The only purpose of advertising is to make sales. It is profitable or unprofitable according to its actual sales.