Marketing is essential to get technical products out to the masses. If the folks who create technical products can't convince anyone to buy or use them, then the creation is a moot point.
Intelligence is needed to market products. It's a different way of thinking, but it's still thinking. Marketing folk may very nearly never understand the technical side of the products they're promoting, but the engineers, programmers and scientists very nearly never understand how humans in general react to various stimuli, how to separate populations into demographics, how to choose which demographics certain products will appeal to, how to increase the appeal of a product within those demographics, how to get across a meaningful message in the time it takes for someone to glance at a billboard, etc. Purposeful social interaction takes quite a bit of thought; persuasion of the masses takes a deep understanding of the human psyche.
Without people capable of successful marketing, scientific advancement would slow to a crawl. Without sales, there's no money. Without money, there's nothing to pay all techie people to invent or improve anything. Even governments need to be sold on paying for R&D. And don't try to convince me that politicians in charge of budgets think logically :-P
In other words, just because you don't understand something, it doesn't make it dumb. Science is only one facet of this "bright new world". Without all the rest of the people doing the things you don't understand, you'd be living in a cave with a spear, but unable to convince anyone to go out, put themselves in danger and use the spear to get some food.