HI's provide a great service. Finding 'safety hazards' when performing a visual inspection, non invasive, serves everyone.
My problem is when HI's put on the hat of an electrician or an electrical inspector. Citing code or implying the "safe" installation of the electrical system.
Some states, like mine, have rules on who can do what.
Example:
3783.06 Certificate required.
No person shall engage in the practice of electrical inspection in this state unless he is the holder of a certificate of competency as an electrical safety inspector issued under Chapter 3783. of the Revised Code. Any person practicing or offering to practice electrical inspection shall show proof of his certification upon request as provided by rules of the board of building standards.
Effective Date: 03-22-1973
http://codes.ohio.gov/orc/3783.06