Well lets take Elon musk for example he hires people that are smarter than him who works very hard to build his own empire and he gets more super rich and while their employees just gets their normal pay. This is how Billionaires get rich and their employees earn the little they do.
I dont think billionaires can do without some smart people around them, left alone they can only do as little as they can, and I doubt if there is any right thinking Employers that would even hire an employee who arent smarter especially when the employees are in very important position.
Elon is a good example when it comes in doing business, its indeed important to get smarter people who can do the job well at the same time contribute ideas into betterment of the project. His SpaceX project as well his other projects are proofs that smarter people can do his ideas. The only thing needed is the owner should have a quality of a leader that he can use in his employee that even they are smarter from him he knows how to handle them and will still follow him as their superior or boss.