I find the license topic to be a common concern when engaging with people on libertarian topics. Many people can grasp the idea of private initiatives replacing government ones, but yet have a hard time disbelieving that a government blessing to work somehow ensures quality. I work in healthcare so I have a license, and practically everyone else around me does as well. However, every month when my State Board newsletter arrives, I have only to turn to the last 1/2 of it to see how well a license works. Page after page of revocations, suspensions, and probations. Some of the charges had no bearing on their practice such as a DUI. You have a few drinks too many and the state says you can no longer practice your skills.