Yeah, because Coke and Pepsi really need to advertise, and Budweiser always sells more beer because they advertise.
Look, you can keep trying to say that because people spend money on it, it must still be working, however, smarter people than I have run scientific studies showing that advertising just doesn't work as well as was thought previously. Try it yourself if you like, buy an advertisement for something and see how much interest you get. Digital media has shown the advertisers that ads just don't work. The clickthrough on advertisements in digital media is abismal. It is widely considered now that the traditional media advertising response rates was wildly inflated and was likely nowhere near what it was claimed to be.
But I'm the one without a valid function...have a GOOD day to you too.