The government is not a business. So hiring a businessman to run the government does not make much sense.
Because it's different. Like cats and dogs. Did you ever take your cat for a walk? No, because cats are different than dogs and they don't like to go on walks.
likewise, the government is not a business, so you run it in a different way.
Now, experience in running a business can be useful when assuming a position in gov't. But it is not the same.