I think it would be in society's interest to know the credibility of someone repairing and selling 2 tons of metal that will go out on the road and pose considerable risk to others' and the driver's lives on the road. See the limo crash that just killed 18 in New York state.
There might be situations where corrupt government is inhibiting competition for the gain of particular parties, but some things do make sense, such as being bonded when the risk of the work you are performing could be result in large costs.