Most of the DIY people are looking for conformation that what they are doing will not burn down their house but could care less about the codes. If they are trying to even be close to right then they will have their work inspected and guess what the inspector is sworn to use during their inspection.
But then again over 90% of the DIY will neither get a permit nor an inspection and take a chance that their homeowner’s insurance does not have to do an investigation.
Here in NC the code enforcement official is required to take and pass a course at a community college before he can get a Standard Certificate in the field of inspection for which they seek employment. They take an oath to enforce the codes as adopted by the state.