An expensive ad represents the toil, attention, testing, wit, art, and skill of many people. Far more thought and care go into the composition of any prominent ad in a newspaper or magazine than go into the writing of their features and editorials. Any expensive ad is as carefully built on the tested foundations of public stereotypes or 'sets' of established attitudes, as any skyscraper is built on bedrock.
Without encryption, you and I wouldn't be able to do our banking online. We wouldn't be able to buy things online, because your credit cards - they've probably been ripped off anyway, but they would be ripped off left and right every day if there wasn't encryption.