The profession is about enthusiasm and confidence. So, many people there are constantly smiling, wide-eyed, vigorously shaking your hand like you're their lost brother, telling you how happy you'll be with the product, and so on. Many of them. They're also usually successful to some degree.
I can't see how looking crazy with wide open eyes and fake smiles correlates with "sales teams and marketing execs."
That's a completely gratuitous caricature.