Given the quality of their politicians, it is understandable that Republicans would want a non-politician as their presidential candidate. Sadly for them, the three they have on offer are unlikely to be any better than the rest of the incompetents crowding their field.
Government is not a business. We don't allow it to be a business, because as soon as any government enterprise threatens to make some money, it gets privatized. Even if it were a business, we still wouldn't want anybody as incompetent as Donald or Carly running it.
Donald inherited $60 million from his father, and now he claims to be worth eight billion, albeit Forbes estimates that four billion probably is more like it. Had he invested his inheritance in a fund indexed to the S&P 500, he'd be worth twelve billion today. Actively managing his money, apparently, was a costly mistake. As for his Atlantic City bankruptcies, he probably should have noticed all the casinos opening in neighboring states because Grover Norquist wouldn't allow them to raise taxes.
As became clear during her Senate run against Barbara Boxer, Carly really did screw up at HP, and her prior efforts at Lucent were not much better. Her self-declared "successes," like the merger with COMPAQ, had to be undone by her successors to avoid financial disaster. One successful put-down of Donald Trump does not a presidential candidate make, or the field would be filled with late-night comedians.
As for Ben Carson, a brain surgeon does not have to be a "rocket scientist." Brain surgery is a manual skill, rather like a higher level of auto mechanics. Just the fact that a person can separate conjoined twins while believing the universe is 6000 years old should tell us something.
Whoever the Republicans are left with in the end is likely to be more than a little shopworn, On the Democratic side, though, Hillary also has been subject to more than a little wear and tear. It's beginning to look like record low voter turnout in 2016.