Didn't you have ads in the 20th century?
Well, sure, but not in our dreams. Only on TV and radio. And in magazines, and movies, and at ball games, and on buses, and milk cartons, and T-shirts, and bananas, and written on the sky... But not in dreams, no siree!
Fuck your decimal system. Dozenal is the most intuitive number system. Arithmetic is so much easier to learn in dozenal and you can even count higher on your hands if you use phalanges instead of fingers. Base 10 is a crap number system. It's barely composite, it only has two prime factors.